1,1

If 4p-1 is prime then n^2+n+p = p(4p-1) for some n = 1,2,3,...[Pf. Let n+1 = 2p, etc.].

Table of n, a(n) for n=1..46.

Sequence in context: A055939 A154555 A285016 * A307965 A323109 A023267

Adjacent sequences: A162854 A162855 A162856 * A162858 A162859 A162860

nonn

Daniel Tisdale, Jul 14 2009

More terms from N. J. A. Sloane, Jul 19 2009

approved