A120311 Numbers k such that pi(k) == 0 (mod 4), where pi() = A000720, and such that prime(k) == 3 (mod 4).

8, 9, 19, 20, 22, 38, 39, 54, 56, 58, 72, 90, 91, 92, 93, 94, 95, 96, 107, 131, 132, 133, 153, 154, 155, 156, 173, 175, 177, 193, 195, 224, 225, 239, 240, 266, 281, 282, 311, 340, 344, 346, 360, 363, 364, 365, 383, 385, 386, 387

Offset

1,1

Links

Table of n, a(n) for n=1..50.

Mathematica

a = Flatten[Table[If[Mod[PrimePi[n], 4] == 0&& Mod[Prime[n], 4] -3 == 0, n, {}], {n, 1, 200}]]
Select[Range[400], Mod[PrimePi[#], 4]==0&&Mod[Prime[#], 4]==3&] (* Harvey P. Dale, Apr 17 2019 *)

Crossrefs

Cf. A000720. Intersection of A080148 and A120309.

Sequence in context: A069809 A067544 A022313 * A061414 A240915 A281225

Adjacent sequences: A120308 A120309 A120310 * A120312 A120313 A120314

Keyword

nonn

Author

Roger L. Bagula, Jun 20 2006

Extensions

Edited and more terms added by Michel Marcus, Jun 01 2013

Offset corrected by Michel Marcus, Feb 10 2021

Status

approved