57357

Appears in sequences

• a(n+2) = a(n+1) + a(n) - (2*n + 1) where a(0)=7, a(1)=11.at n=20A088981
• Numbers n such that n and the four successive integers produce primes if substituted for x in the polynomial 5x^2+5x+1. See A090562, A090563. Terms show that longer similar chains also exist.at n=25A090100
• 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, 0, 0), (-1, 1, 0), (1, -1, -1), (1, 1, 0)}.at n=10A149088
• Least positive integer k such that Sum_{i=1..k} phi(i) >= 10^n.at n=9A343802