A238399 a(n) is the number of primes occurring between A053182(n) and A053183(n) (excluding the endpoints).

2, 3, 7, 55, 255, 478, 663, 984, 1237, 1955, 3021, 3214, 8312, 13519, 38267, 40805, 45400, 47444, 48835, 55269, 56758, 59032, 66067, 92141, 93063, 103620, 106611, 108602, 112713, 140874, 151335, 163314, 178215, 183330, 211350, 235410, 244165, 265160, 275971

Offset: 1

Author

Torlach Rush, Feb 26 2014

Keywords

• nonn

Links

• Giovanni Resta, Table of n, a(n) for n = 1..2500

Crossrefs

Cf. A053182, A053183

Programs

Mathematica

(PrimePi[#^2 + #] - PrimePi[#]) & /@  Select[Prime@Range@500, PrimeQ[#^2 + # + 1] &] (* Giovanni Resta, Feb 27 2014 *)

Extensions

a(33)-a(39) from Giovanni Resta, Feb 27 2014