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

%I #22 Feb 10 2021 03:29:32

%S 8,9,19,20,22,38,39,54,56,58,72,90,91,92,93,94,95,96,107,131,132,133,

%T 153,154,155,156,173,175,177,193,195,224,225,239,240,266,281,282,311,

%U 340,344,346,360,363,364,365,383,385,386,387

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

%t a = Flatten[Table[If[Mod[PrimePi[n], 4] == 0&& Mod[Prime[n], 4] -3 == 0, n, {}], {n, 1, 200}]]

%t Select[Range[400],Mod[PrimePi[#],4]==0&&Mod[Prime[#],4]==3&] (* _Harvey P. Dale_, Apr 17 2019 *)

%Y Cf. A000720. Intersection of A080148 and A120309.

%K nonn

%O 1,1

%A _Roger L. Bagula_, Jun 20 2006

%E Edited and more terms added by _Michel Marcus_, Jun 01 2013

%E Offset corrected by _Michel Marcus_, Feb 10 2021

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Last modified March 28 17:25 EDT 2024. Contains 371254 sequences. (Running on oeis4.)