21993

Appears in sequences

• Limit number of (m-n)-almost-primes in range [2^m..2^{m+1}-1].at n=12A092097
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 1, 1), (0, 1, 0), (1, -1, 1), (1, 1, -1)}.at n=9A148437
• Number of ordered triples (w,x,y) with all terms in {1,...,n} and 2w^3>=x^3+y^3.at n=36A211804
• Positions of 3's in A234323.at n=63A234804
• Number of ballot sequences of length 2n with exactly n fixed points.at n=9A238803
• Numbers that divide the sum of the factorials of their digits in base 10.at n=21A247227
• Numbers k such that (10^k + 191)/3 is prime.at n=17A294916
• Number of edges in a complete bipartite graph where the vertices in the two parts are placed on opposite sides of a parabola at integer y coordinates y = 1, 2, ...n.at n=14A392444