Sequences
392,541 sequences
- Periods of sum of 8th powers of digits iterated until the sequence becomes periodic.A031211
Periods of sum of 8th powers of digits iterated until the sequence becomes periodic.
- Periods of sum of 9th powers of digits iterated until the sequence becomes periodic.A031212
Periods of sum of 9th powers of digits iterated until the sequence becomes periodic.
- Periods of sum of 10th powers of digits iterated until the sequence becomes periodic.A031213
Periods of sum of 10th powers of digits iterated until the sequence becomes periodic.
- Initial term of sequence An.A031214
Initial term of sequence An.
- Even-indexed primes: a(n) = prime(2n).A031215
Even-indexed primes: a(n) = prime(2n).
- Write primes in base 10 but interpret as if in base 11.A031216
Write primes in base 10 but interpret as if in base 11.
- Number of terms in longest arithmetic progression of consecutive primes starting at n-th prime (conjectured to be unbounded).A031217
Number of terms in longest arithmetic progression of consecutive primes starting at n-th prime (conjectured to be unbounded).
- Largest prime power <= n.A031218
Largest prime power <= n.
- Write n in base 5 and juxtapose.A031219
Write n in base 5 and juxtapose.
- Position of n-th 0 in A031219.A031220
Position of n-th 0 in A031219.
- Position of n-th 1 in A031219.A031221
Position of n-th 1 in A031219.
- Position of n-th 2 in A031219.A031222
Position of n-th 2 in A031219.
- Position of n-th 3 in A031219.A031223
Position of n-th 3 in A031219.
- Position of n-th 4 in A031219.A031224
Position of n-th 4 in A031219.
- a(n) = least k such that base 5 representation of n begins at s(k), where s = A031219.A031225
a(n) = least k such that base 5 representation of n begins at s(k), where s = A031219.
- Length of n-th run of digit 0 in A031219.A031226
Length of n-th run of digit 0 in A031219.
- Length of n-th run of digit 1 in A031219.A031227
Length of n-th run of digit 1 in A031219.
- Length of n-th run of digit 2 in A031219.A031228
Length of n-th run of digit 2 in A031219.
- Length of n-th run of digit 3 in A031219.A031229
Length of n-th run of digit 3 in A031219.
- Length of n-th run of digit 4 in A031219.A031230
Length of n-th run of digit 4 in A031219.
- (# 1's)-(# 0's) in first n terms of A031219.A031231
(# 1's)-(# 0's) in first n terms of A031219.
- a(n)=(# 1's)-(# 2's) in first n terms of A031219.A031232
a(n)=(# 1's)-(# 2's) in first n terms of A031219.
- (# 2's)-(# 3's) in first n terms of A031219.A031233
(# 2's)-(# 3's) in first n terms of A031219.
- (# 3's)-(# 4's) in first n terms of A031219.A031234
(# 3's)-(# 4's) in first n terms of A031219.
- Triangle T(n,k): write n in base 5, reverse order of digits.A031235
Triangle T(n,k): write n in base 5, reverse order of digits.
- Position of n-th 0 in A031235.A031236
Position of n-th 0 in A031235.
- Position of n-th 1 in A031235.A031237
Position of n-th 1 in A031235.
- Position of n-th 2 in A031235.A031238
Position of n-th 2 in A031235.
- Position of n-th 3 in A031235.A031239
Position of n-th 3 in A031235.
- Position of n-th 4 in A031235.A031240
Position of n-th 4 in A031235.
- a(n)=least k such that base 5 representation of n begins at s(k), where s=A031235.A031241
a(n)=least k such that base 5 representation of n begins at s(k), where s=A031235.
- Length of n-th run of digit 0 in A031235.A031242
Length of n-th run of digit 0 in A031235.
- Length of n-th run of digit 1 in A031235.A031243
Length of n-th run of digit 1 in A031235.
- Length of n-th run of digit 2 in A031235.A031244
Length of n-th run of digit 2 in A031235.
- Length of n-th run of digit 3 in A031235.A031245
Length of n-th run of digit 3 in A031235.
- Length of n-th run of digit 4 in A031235.A031246
Length of n-th run of digit 4 in A031235.
- a(n)=(# 1's)-(# 0's) in first n terms of A031235.A031247
a(n)=(# 1's)-(# 0's) in first n terms of A031235.
- a(n)=(# 1's)-(# 2's) in first n terms of A031235.A031248
a(n)=(# 1's)-(# 2's) in first n terms of A031235.
- a(n)=(# 2's)-(# 3's) in first n terms of A031235.A031249
a(n)=(# 2's)-(# 3's) in first n terms of A031235.
- (# 3's)-(# 4's) in first n terms of A031235.A031250
(# 3's)-(# 4's) in first n terms of A031235.
- Write n in base 5, then complement each digit (d -> 4-d) and juxtapose.A031251
Write n in base 5, then complement each digit (d -> 4-d) and juxtapose.
- Least k such that base 5 representation of n begins at s(k), where s=A031251.A031252
Least k such that base 5 representation of n begins at s(k), where s=A031251.
- Write 2n-1 in base 5 and juxtapose.A031253
Write 2n-1 in base 5 and juxtapose.
- Position of n-th 0 in A031253.A031254
Position of n-th 0 in A031253.
- Position of n-th 1 in A031253.A031255
Position of n-th 1 in A031253.
- Position of n-th 2 in A031253.A031256
Position of n-th 2 in A031253.
- Position of n-th 3 in A031253.A031257
Position of n-th 3 in A031253.
- Position of n-th 4 in A031253.A031258
Position of n-th 4 in A031253.
- a(n)=least k such that base 5 representation of n begins at s(k), where s=A031253.A031259
a(n)=least k such that base 5 representation of n begins at s(k), where s=A031253.
- Length of n-th run of digit 0 in A031253.A031260
Length of n-th run of digit 0 in A031253.