A260893 Primes having only {1, 7, 9} as digits.

7, 11, 17, 19, 71, 79, 97, 179, 191, 197, 199, 719, 797, 911, 919, 971, 977, 991, 997, 1117, 1171, 1777, 1979, 1997, 1999, 7177, 7717, 7919, 9199, 9719, 9791, 11117, 11119, 11171, 11177, 11197, 11717, 11719, 11777, 11779, 11971, 17117, 17191, 17791, 17911

Offset: 1

Author

Vincenzo Librandi, Aug 11 2015

Keywords

• nonn
• easy
• base

Comments

A020455, A020457 and A020471 are subsequences.

Subsequence of A030096.

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..10000
• Index to entries for primes with digits in a given set

Crossrefs

Cf. similar sequences listed in A260889.

Cf. A000040, A020455, A020457, A020471, A030096.

Programs

Magma

[p: p in PrimesUpTo(3*10^4) | Set(Intseq(p)) subset [1, 7, 9]];

Mathematica

Select[Prime[Range[3 10^3]], Complement[IntegerDigits[#], {1, 7, 9}] == {}&]