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A120311 Numbers n such that pi(n) == 0 mod 4, where pi() = A000720, and such that prime(n) == 3 mod 4. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..49.

FORMULA

a(n) = If[Mod[PrimePi[n], 4] == 0&& Mod[Prime[n], 4] - 3 == 0, n]

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

Subsequence of 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

STATUS

approved

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Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)