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A111069 Numbers k such that 3*k^2 + 25 is prime. 4

%I #16 Feb 09 2020 13:10:51

%S 2,4,12,14,18,24,26,28,38,46,56,66,74,84,96,98,102,112,124,126,128,

%T 144,152,164,168,182,186,212,214,236,238,252,254,262,266,268,278,284,

%U 304,306,312,324,332,334,338,352,362,378,388,392,396

%N Numbers k such that 3*k^2 + 25 is prime.

%H Daniel Starodubtsev, <a href="/A111069/b111069.txt">Table of n, a(n) for n = 1..10000</a>

%e If k=96 then 3*k^2 + 25 = 27673 (prime).

%t Select[Range[0, 400], PrimeQ[3*#^2 + 25] &] (* _Stefan Steinerberger_, Mar 03 2006 *)

%o (PARI) is(n)=isprime(3*n^2+25) \\ _Charles R Greathouse IV_, Jun 06 2017

%Y Cf. A111068.

%K nonn,easy

%O 1,1

%A _Parthasarathy Nambi_, Oct 08 2005

%E More terms from _Stefan Steinerberger_, Mar 03 2006

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Last modified April 23 03:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)