25821

Appears in sequences

• Number of 3's in n-th term of A007651.at n=42A022468
• a(n) = n-th prime number * n-th lucky number.at n=35A032601
• Numbers k such that prime(k) + prime(k+1)*2 is a square.at n=32A064504
• Number of circular permutations with exactly one specified increasing or decreasing modular run (3-sequence), with clockwise and counterclockwise traversals not counted as distinct.at n=10A235937
• Number of integer partitions of n with reverse-alternating sum < 0.at n=42A344608
• Number of integer partitions of 2n with reverse-alternating sum < 0.at n=21A344743
• Index of smallest pentagonal number with n digits.at n=9A368088