A020461 Primes that contain digits 3 and 4 only.

3, 43, 433, 443, 3343, 3433, 33343, 333433, 334333, 343333, 343433, 444343, 444443, 3333433, 3343343, 3343433, 3344333, 3344443, 3433333, 3434443, 3443443, 3444443, 4344443, 4433333, 4434343, 4443433, 34333333, 34434343, 34444343, 43444433

Offset: 1

Author

David W. Wilson

Keywords

• nonn
• base

Links

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

Crossrefs

Cf. A054356.

Programs

Magma

[p: p in PrimesUpTo(43444433) | Set(Intseq(p)) subset [3,4]];
// Bruno Berselli, Jul 27 2012

Mathematica

Flatten[Table[Select[FromDigits/@Tuples[{3,4},n],PrimeQ],{n,8}]] (* Vincenzo Librandi, Jul 27 2012 *)