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A154331 Numbers m such that 12 m^2 is the average of a twin prime pair. 6
1, 3, 4, 6, 11, 13, 17, 20, 29, 39, 94, 108, 136, 154, 158, 172, 214, 227, 245, 256, 262, 283, 288, 290, 308, 315, 328, 357, 358, 371, 403, 413, 414, 420, 475, 491, 510, 522, 536, 543, 546, 556, 559, 561, 581, 585, 622, 630, 633, 647, 666, 669, 676, 699, 735 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Harvey P. Dale)

MATHEMATICA

Select[Range[800], AllTrue[12#^2+{1, -1}, PrimeQ]&] (* The program uses the AllTrue function from Mathematica version 10 *) (* Harvey P. Dale, Aug 27 2014 *)

PROG

(PARI) for(i=1, 999, isprime(12*i^2+1) & isprime(12*i^2-1) & print1(i", "))

(Magma) [m:m in [1..740]| IsPrime(12*m^2-1) and IsPrime(12*m^2+1)]; // Marius A. Burtea, Jan 23 2020

CROSSREFS

Cf. A037073, A154671.

Sequence in context: A115018 A057030 A230430 * A001130 A348529 A069825

Adjacent sequences: A154328 A154329 A154330 * A154332 A154333 A154334

KEYWORD

nonn

AUTHOR

M. F. Hasler, Jan 15 2009

STATUS

approved

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Last modified December 1 23:44 EST 2022. Contains 358485 sequences. (Running on oeis4.)