A020464 - OEIS

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A020464

Primes that contain digits 3 and 8 only.

3, 83, 383, 883, 3833, 38333, 38833, 83383, 83833, 88883, 333383, 338383, 383833, 3333383, 3383383, 3833833, 3838333, 3838883, 3883333, 3888383, 8338333, 8388833, 8838383, 8838833, 8838883, 8883883, 38383883, 83333333, 83883883, 88838333

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OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

MATHEMATICA

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

Select[Flatten[Table[10#+3&/@(FromDigits/@Tuples[{3, 8}, n]), {n, 0, 7}]], PrimeQ] (* Harvey P. Dale, Jan 06 2019 *)

PROG

(Magma) [p: p in PrimesUpTo(88838333) | Set(Intseq(p)) subset [3, 8]]; // Vincenzo Librandi, Jul 27 2012

CROSSREFS

Sequence in context: A239637 A201963 A261434 * A036943 A178001 A173811

Adjacent sequences: A020461 A020462 A020463 * A020465 A020466 A020467

KEYWORD

nonn,base

AUTHOR

David W. Wilson

STATUS

approved