A214704 Primes that contain only the digits (2, 3, 7).

2, 3, 7, 23, 37, 73, 223, 227, 233, 277, 337, 373, 727, 733, 773, 2237, 2273, 2333, 2377, 2777, 3323, 3373, 3727, 3733, 7237, 7333, 7723, 7727, 22273, 22277, 22727, 22777, 23227, 23327, 23333, 23773, 27277, 27337, 27733, 27737, 27773, 32233, 32237, 32323

Offset: 1

Author

Vincenzo Librandi, Jul 28 2012

Keywords

• nonn
• base
• easy

Comments

The digits are prime numbers excluding 5.

Links

• Jason Bard, Table of n, a(n) for n = 1..10000 (first 1000 terms from Vincenzo Librandi)

Crossrefs

Subsequence of A019546.

Cf. A087363 (primes with only prime digits excluding 2).

Cf. A385776 (main sequence for primes containing three distinct digits).

Programs

Magma

[p: p in PrimesUpTo(80000) | Set(Intseq(p)) subset [2,3,7]];

Mathematica

Flatten[Table[Select[FromDigits/@Tuples[{2,3,7},n],PrimeQ],{n,6}]]