A020463 Primes that contain digits 3 and 7 only.

3, 7, 37, 73, 337, 373, 733, 773, 3373, 3733, 7333, 33377, 33773, 37337, 77377, 77773, 333337, 333737, 373777, 377737, 733333, 733373, 737773, 773777, 777373, 777737, 3333373, 3333773, 3337333, 3337777, 3377377, 3733333, 3773377, 3773773, 3777377, 7337333, 7337777, 7377373, 7733377, 7737337

Offset

1,1

Links

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

MathOverflow, 3-7 primes in base 10

Mathematica

Flatten[Table[Select[FromDigits/@Tuples[{3, 7}, n], PrimeQ], {n, 7}]] (* Vincenzo Librandi, Jul 27 2012 *)

Crossrefs

Subsequence of A030096.

Cf. A143967, A020458.

Sequence in context: A386067 A260381 A260378 * A356668 A057625 A308392

Adjacent sequences: A020460 A020461 A020462 * A020464 A020465 A020466

Keyword

nonn,base

Author

David W. Wilson

Status

approved