A167731 Cubes that becomes a prime number when prefixed with a 7.

1, 27, 19683, 29791, 35937, 50653, 79507, 132651, 185193, 226981, 912673, 2146689, 2685619, 3442951, 3869893, 4330747, 5929741, 8869743, 10503459, 19902511, 28934443, 33076161, 36926037, 38958219, 42508549, 47045881, 49430863

Offset

1,2

Comments

Subsequence of cubes of A032670. - Michel Marcus, Jun 22 2016

Links

G. C. Greubel, Table of n, a(n) for n = 1..10000

Mathematica

Select[Range[1, 500000, 2]^3, PrimeQ[FromDigits[Join[{7}, IntegerDigits[#]]]] &] (* G. C. Greubel, Jun 21 2016 *)

Crossrefs

Cf. A032670.

Sequence in context: A263601 A111415 A036534 * A357506 A343692 A201369

Adjacent sequences: A167728 A167729 A167730 * A167732 A167733 A167734

Keyword

base,nonn

Author

Claudio Meller, Nov 10 2009

Status

approved