A260379 Primes having only {1, 3, 7} as digits.

3, 7, 11, 13, 17, 31, 37, 71, 73, 113, 131, 137, 173, 311, 313, 317, 331, 337, 373, 733, 773, 1117, 1171, 1373, 1733, 1777, 3137, 3313, 3331, 3371, 3373, 3733, 7177, 7331, 7333, 7717, 11113, 11117, 11131, 11171, 11173, 11177, 11311, 11317, 11717, 11731, 11777

Offset: 1

Author

Vincenzo Librandi, Jul 24 2015

Keywords

• nonn
• easy
• base

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

Subsequence of A030096 and A155055. A020451, A020455, and A020463 are subsequences.

Cf. similar sequences listed in A260378.

Cf. A000040, A020451, A020455, A020463.

Programs

Magma

[p: p in PrimesUpTo(2*10^4) | Set(Intseq(p)) subset [1, 3, 7]];

Mathematica

Select[Prime[Range[2 10^3]], Complement[IntegerDigits[#], {1, 3, 7}]=={} &]