19833

Appears in sequences

• Divisors of 2^50 - 1.at n=22A003554
• Numbers k such that x^k + x^8 + 1 is irreducible over GF(2).at n=10A057478
• Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k ascents of length 2.at n=37A102402
• Second elementary symmetric function of the first n terms of (1, 3, 7, 15, 31, ...).at n=5A203242
• Number of (w,x,y) with all terms in {0,...,n} and |w-x|+|x-y|+|y-w| > w+x+y.at n=41A213486
• Number T(n,k) of equivalence classes of ways of placing k 3 X 3 tiles in an n X 10 rectangle under all symmetry operations of the rectangle; irregular triangle T(n,k), n>=3, 0<=k<=3*floor(n/3), read by rows.at n=47A238592
• Triangle read by rows, matrix inverse of A139382.at n=33A342186
• The internal state of the Sinclair ZX81 and Spectrum random number generator.at n=22A357907
• a(n) = number of isogeny classes of abelian surfaces over the finite field of order prime(n).at n=35A362198