Sequences
392,541 sequences
- Numbers with exactly three distinct base-9 digits.A031961
Numbers with exactly three distinct base-9 digits.
- Numbers with exactly three distinct base-10 digits.A031962
Numbers with exactly three distinct base-10 digits.
- a(n) = number of elements of order n in simple group L_2(7) of order 168.A031963
a(n) = number of elements of order n in simple group L_2(7) of order 168.
- Numbers with exactly four distinct base-5 digits.A031964
Numbers with exactly four distinct base-5 digits.
- Numbers with exactly four distinct base-6 digits.A031965
Numbers with exactly four distinct base-6 digits.
- Numbers with exactly four distinct base-7 digits.A031966
Numbers with exactly four distinct base-7 digits.
- Numbers with exactly four distinct base-8 digits.A031967
Numbers with exactly four distinct base-8 digits.
- Numbers with exactly four distinct base-9 digits.A031968
Numbers with exactly four distinct base-9 digits.
- Numbers with exactly four distinct base-10 digits.A031969
Numbers with exactly four distinct base-10 digits.
- Tennis ball problem: Balls 1 and 2 are thrown into a room; you throw one on lawn; then balls 3 and 4 are thrown in and you throw any of the 3 balls onto the lawn; then balls 5 and 6 are thrown in and you throw one of the 4 balls onto the lawn; after n turns, consider all possible collections on lawn and add all the values.A031970
Tennis ball problem: Balls 1 and 2 are thrown into a room; you throw one on lawn; then balls 3 and 4 are thrown in and you throw any of the 3 balls onto the lawn; then balls 5 and 6 are thrown in and you throw one of the 4 balls onto the lawn; after n turns, consider all possible collections on lawn and add all the values.
- a(n) = Sum_{k=1..n} k^n.A031971
a(n) = Sum_{k=1..n} k^n.
- a(n) = Sum_{k=1..n} n^k.A031972
a(n) = Sum_{k=1..n} n^k.
- a(n) = Sum_{k=0..n} n^k.A031973
a(n) = Sum_{k=0..n} n^k.
- 1 repeated prime(n) times.A031974
1 repeated prime(n) times.
- Erroneous version of A000452.A031975
Erroneous version of A000452.
- Remove digits 0, 1, 4, 9 from n.A031976
Remove digits 0, 1, 4, 9 from n.
- Erroneous version of A019516.A031977
Erroneous version of A019516.
- Omit digits 0, 1, 8 from n.A031978
Omit digits 0, 1, 8 from n.
- Smallest digit of n concatenated with largest digit of n is prime.A031979
Smallest digit of n concatenated with largest digit of n is prime.
- a(n) is the smallest number >= 1 not occurring earlier and not the sum of cubes of two distinct earlier terms.A031980
a(n) is the smallest number >= 1 not occurring earlier and not the sum of cubes of two distinct earlier terms.
- a(1) = 1, a(2) = 2, a(n) = smallest number not the sum of cubes of >= 1 distinct earlier terms.A031981
a(1) = 1, a(2) = 2, a(n) = smallest number not the sum of cubes of >= 1 distinct earlier terms.
- a(n) = 1(01)^(2*n+1).A031982
a(n) = 1(01)^(2*n+1).
- Numbers with exactly five distinct base-6 digits.A031983
Numbers with exactly five distinct base-6 digits.
- Numbers with exactly five distinct base-7 digits.A031984
Numbers with exactly five distinct base-7 digits.
- Numbers with exactly five distinct base-8 digits.A031985
Numbers with exactly five distinct base-8 digits.
- Numbers with exactly five distinct base-9 digits.A031986
Numbers with exactly five distinct base-9 digits.
- Numbers with exactly five distinct base-10 digits.A031987
Numbers with exactly five distinct base-10 digits.
- Duplicate of A023745.A031988
Duplicate of A023745.
- Duplicate of A023746.A031989
Duplicate of A023746.
- Duplicate of A023747.A031990
Duplicate of A023747.
- Smallest n-digit norep emirp.A031991
Smallest n-digit norep emirp.
- Duplicate of A023749.A031992
Duplicate of A023749.
- Duplicate of A023750.A031993
Duplicate of A023750.
- Duplicate of A023751.A031994
Duplicate of A023751.
- Duplicate of A023752.A031995
Duplicate of A023752.
- Duplicate of A023753.A031996
Duplicate of A023753.
- Odd numbers which when cubed give number composed just of the digits 0, 1, 2, 3.A031997
Odd numbers which when cubed give number composed just of the digits 0, 1, 2, 3.
- Duplicate of A023759.A031998
Duplicate of A023759.
- Numbers whose base-4 digits are in nonincreasing order.A031999
Numbers whose base-4 digits are in nonincreasing order.
- "AFJ" (ordered, size, labeled) transform of 2,2,2,2,...A032000
"AFJ" (ordered, size, labeled) transform of 2,2,2,2,...
- "AFJ" (ordered, size, labeled) transform of 2,1,1,1,...A032001
"AFJ" (ordered, size, labeled) transform of 2,1,1,1,...
- "AFJ" (ordered, size, labeled) transform of 1,2,3,4,...A032002
"AFJ" (ordered, size, labeled) transform of 1,2,3,4,...
- "AFJ" (ordered, size, labeled) transform of 1,3,5,7,...A032003
"AFJ" (ordered, size, labeled) transform of 1,3,5,7,...
- Shifts left under "AFJ" (ordered, size, labeled) transform.A032004
Shifts left under "AFJ" (ordered, size, labeled) transform.
- "AFK" (ordered, size, unlabeled) transform of 2,2,2,2,...A032005
"AFK" (ordered, size, unlabeled) transform of 2,2,2,2,...
- "AFK" (ordered, size, unlabeled) transform of 2,1,1,1,...A032006
"AFK" (ordered, size, unlabeled) transform of 2,1,1,1,...
- "AFK" (ordered, size, unlabeled) transform of 1,2,3,4,...A032007
"AFK" (ordered, size, unlabeled) transform of 1,2,3,4,...
- "AFK" (ordered, size, unlabeled) transform of 1,3,5,7,...A032008
"AFK" (ordered, size, unlabeled) transform of 1,3,5,7,...
- Number of planted planar trees (n+1 nodes) where any 2 subtrees extending from the same node have a different number of nodes.A032009
Number of planted planar trees (n+1 nodes) where any 2 subtrees extending from the same node have a different number of nodes.
- Number of rooted planar trees where any 2 subtrees extending from same node have a different number of nodes.A032010
Number of rooted planar trees where any 2 subtrees extending from same node have a different number of nodes.