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A064968 Numbers k such that 1000000000k+1, 1000000000k+3, 1000000000k+7, 1000000000k+9 are all primes. 1
14965, 16813, 20767, 23083, 34270, 40198, 93238, 112096, 189802, 192484, 251248, 333946, 334969, 363514, 374107, 375127, 376765, 383473, 405046, 419458, 462928, 498139, 649948, 703246, 704374, 732463, 767101, 781885, 806467, 812902, 842428 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Range[10^6], PrimeQ[10^9# + 1] && PrimeQ[10^9# + 3] && PrimeQ[10^9# + 7] && PrimeQ[10^9# + 9] &]

PROG

(PARI) { n=0; for (m=1, 10^9, b=10^9*m; if(isprime(b + 1) && isprime(b + 3) && isprime(b + 7) && isprime(b + 9), write("b064968.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Oct 01 2009

CROSSREFS

Cf. A007811, A064687.

Sequence in context: A235236 A203404 A236352 * A178929 A145275 A234654

Adjacent sequences:  A064965 A064966 A064967 * A064969 A064970 A064971

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Oct 29 2001

STATUS

approved

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Last modified July 25 12:15 EDT 2021. Contains 346290 sequences. (Running on oeis4.)