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A064975 Numbers n such that n*10-1, n*10-3, n*10-7 and n*10-9 are all prime. 2
2, 11, 20, 83, 149, 188, 209, 326, 347, 566, 944, 1301, 1565, 1574, 1607, 1805, 1892, 1943, 2102, 2228, 2531, 3173, 3485, 4379, 5135, 5534, 6299, 6722, 6950, 7223, 7727, 7970, 8105, 8273, 8882, 9785, 9914, 10112, 10985, 11654, 11930, 12221, 13547 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..43.

MATHEMATICA

Select[Range[10^5], PrimeQ[10# - 1] && PrimeQ[10# - 3] && PrimeQ[10# - 7] && PrimeQ[10# - 9] &]

CROSSREFS

Sequence in context: A279772 A226416 A146087 * A115095 A061907 A052216

Adjacent sequences:  A064972 A064973 A064974 * A064976 A064977 A064978

KEYWORD

easy,nonn

AUTHOR

Robert G. Wilson v, Oct 30 2001

STATUS

approved

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Last modified February 20 23:24 EST 2019. Contains 320362 sequences. (Running on oeis4.)