20833

Appears in sequences

• a(n) = Sum_{k=0..n} ceiling(k^3/n).at n=42A014813
• For each permutation p of {1,2,...,n} define maxjump(p) = max(p(i) - i); a(n) is sum of maxjumps of all p.at n=6A018927
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite EUO = EU-1 Nan[AlnSi112-nO224] starting with a T9 atom.at n=13A019128
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones.at n=26A031846
• Numbers k such that 179*2^k+1 is prime.at n=28A032466
• Quotients k*(k+1)*(k+2) / (k+(k+1)+(k+2)) that are lucky numbers.at n=17A032792
• Pell pseudoprimes: odd composite numbers n such that P(n)-Kronecker(2,n) is divisible by n.at n=26A099011
• Floor[1/{(3+n^4)^(1/4)}], where {}=fractional part.at n=24A184538
• a(n) = 12*n^2 - 8*n + 1.at n=42A185212
• a(n) = (2*n^3 + 3*n^2 + n + 3)/3.at n=31A188475
• Numbers n such that A229964(n) = 3.at n=22A229966
• Number of ways to place 3 points on an n X n X n triangular grid so that no pair of them has distance sqrt(3).at n=8A244501
• Number of partitions p of n that contain a proper partition of the maximal part of p.at n=37A279036
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+20830) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=3A283887
• Binomial(n,4) - A290447(n).at n=40A290461
• a(n) = A006561(n) - A290447(n).at n=40A290465
• Solution of the complementary equation a(n) = 2*a(n-2) + b(n-2), where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=23A295067
• Composite numbers k such that Pell(k) == 1 (mod k).at n=29A319042
• Composite numbers k coprime to 8 such that k divides Pell(k - Kronecker(8,k)), Pell = A000129.at n=37A327651
• Intersection of A099011 and A327651.at n=15A327652