A097697 - OEIS

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A097697

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

1, 2, 4, 5, 7, 11, 14, 19, 25, 26, 31, 32, 35, 37, 38, 46, 47, 53, 56, 61, 65, 67, 70, 73, 77, 79, 80, 86, 89, 109, 115, 121, 122, 124, 128, 137, 143, 149, 152, 158, 161, 163, 170, 175, 178, 182, 184, 199, 203, 208, 212, 215, 217, 220, 229, 235, 236, 242, 254, 256

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..60.

PROG

MAGMA) [n: n in [1..1000] |IsPrime(4*n^2+3)]; // Vincenzo Librandi, Nov 16 2010

(PARI) is(n)=isprime(4*n^2+3) \\ Charles R Greathouse IV, Jun 05 2017

CROSSREFS

Cf. A083022, A097698.

Sequence in context: A090614 A171022 A373030 * A035620 A363045 A022439

Adjacent sequences: A097694 A097695 A097696 * A097698 A097699 A097700

KEYWORD

easy,nonn

AUTHOR

Carl R. White, Aug 20 2004

STATUS

approved