200777

Appears in sequences

• Quasi-Carmichael numbers to base 5: squarefree composites n such that (n,2*3) = 1 and prime p|n ==> p-5|n-5.at n=20A029558
• a(1) = 31, a(n) = prime(a(n-1)) - 3a(n-1).at n=10A179514
• Hyper-Wiener index of a benzenoid consisting of a spiral chain of n hexagons (s=1; see the Gutman et al. reference).at n=19A193392
• Quasi-Carmichael numbers to at least one negative base and at least one positive base.at n=23A257759