25746

Appears in sequences

• Numbers having four 2's in base 8.at n=33A043432
• a(0) = 2 and, for n >= 1, rewrite 0->100 in the binary expansion of n and append 10 to the right.at n=16A080310
• Indices of prime numbers in A014258.at n=29A101760
• Sum of the even parts in all partitions of n into distinct parts.at n=41A116684
• Numbers k such that the k-th triangular number contains only digits {1,3,4}.at n=4A119112
• Record (maximal) gaps between prime triples (p, p+2, p+6).at n=35A201598
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w^3>=x^3+y^3.at n=38A211804
• Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any horizontal, vertical, diagonal or antidiagonal neighbor, and containing the value n(n+1)/2-2.at n=20A211911
• The number of P-positions in the game of Nim with up to four piles, allowing for piles of zero, such that the total number of objects in all piles doesn't exceed 2n.at n=35A237686
• Irregular triangle T(n,k) (n >= 0, k >= 2) read by rows. Consider the planar graph formed from an equilateral triangle with n equally spaced points placed on each edge, as discussed in A092867(n+1). Then T(n,k) is the number of interior points where exactly k chords cross.at n=50A366479
• a(n) is the number of shallow permutations of length n that avoid 231.at n=11A382570
• Number of integer partitions of n whose parts do not have choosable sets of integer partitions.at n=39A387134