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

1,1

Links

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

Mathematica

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

Crossrefs

Cf. A053182, A053183

Sequence in context: A270402 A253574 A343557 * A159611 A156585 A354744

Adjacent sequences: A238396 A238397 A238398 * A238400 A238401 A238402

Keyword

nonn

Author

Torlach Rush, Feb 26 2014

Extensions

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

Status

approved