A120312 Numbers k such that pi(k) == 0 (mod 4), where pi() = A000720, and such that prime(k) == 1 (mod 4).

7, 10, 21, 37, 40, 53, 55, 57, 71, 89, 108, 134, 135, 136, 151, 152, 174, 176, 178, 194, 196, 223, 226, 263, 264, 265, 267, 268, 312, 337, 338, 339, 341, 342, 343, 345, 359, 361, 362, 366, 384, 388

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Mathematica

a = Flatten[Table[If[Mod[PrimePi[n], 4] == 0&& Mod[Prime[n], 4] - 1 == 0, n, {}], {n, 1, 200}]]

Crossrefs

Cf. A000720. Intersection of A080147 and A120309.

Sequence in context: A363292 A327977 A097634 * A074377 A103119 A054224

Adjacent sequences: A120309 A120310 A120311 * A120313 A120314 A120315

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