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A120460 Primes p such that (3*p^2+1)/4 is prime. 1
3, 5, 7, 13, 19, 23, 29, 47, 61, 83, 97, 127, 149, 163, 173, 181, 191, 211, 239, 251, 257, 281, 307, 313, 317, 331, 359, 373, 383, 419, 433, 439, 449, 467, 491, 503, 593, 607, 617, 631, 643, 701, 709, 719, 751, 797, 811, 839, 859, 883, 887, 937, 971, 1013, 1049 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Prime terms in A121259 = numbers n such that (3n^2+1)/4 is prime.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Prime[Range[200]], PrimeQ[(3#^2+1)/4]&] (* Harvey P. Dale, Apr 25 2017 *)

CROSSREFS

Cf. A121259.

Sequence in context: A164642 A247633 A277717 * A127459 A174635 A075579

Adjacent sequences:  A120457 A120458 A120459 * A120461 A120462 A120463

KEYWORD

base,nonn

AUTHOR

Zak Seidov, Aug 25 2006

STATUS

approved

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Last modified June 21 01:09 EDT 2021. Contains 345338 sequences. (Running on oeis4.)