A064975 Numbers n such that n*10-1, n*10-3, n*10-7 and n*10-9 are all prime.

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

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 A341003 A061907

Adjacent sequences: A064972 A064973 A064974 * A064976 A064977 A064978

Keyword

easy,nonn

Author

Robert G. Wilson v, Oct 30 2001

Status

approved