22581

Appears in sequences

• Numbers k such that 2*7^k - 1 is prime.at n=13A002959
• 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, 0), (-1, 1, -1), (0, 0, 1), (0, 1, -1), (1, -1, 0)}.at n=11A148083
• G.f. A(x) equals an infinite symmetric composition of functions x+x^n, n=2,3,4,...at n=9A163136
• a(n) is the smallest number such that a(n)*n is an anagram of a(n) * 7.at n=25A175696
• a(n) = n*(n + 1)*(7*n + 11)/6.at n=26A255687