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 A020456 Primes that contain digits 1 and 8 only. 5
 11, 181, 811, 881, 1181, 1811, 8111, 18181, 81181, 88811, 1111181, 1181881, 1881181, 1881811, 1881881, 8118181, 8181881, 8188111, 8188181, 8818811, 8881111, 8881811, 11818181, 11881811, 11888111, 18111881, 18118811, 18181181, 18811181, 18888811 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA Flatten[Table[Select[FromDigits/@Tuples[{1, 8}, n], PrimeQ], {n, 8}]] (* Vincenzo Librandi, Jul 27 2012 *) PROG (MAGMA) [p: p in PrimesUpTo(18888811) | Set(Intseq(p)) subset [1, 8]]; // Vincenzo Librandi, Jul 27 2012 CROSSREFS Sequence in context: A174979 A157945 A106907 * A036935 A205088 A241193 Adjacent sequences:  A020453 A020454 A020455 * A020457 A020458 A020459 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified May 26 14:39 EDT 2020. Contains 334626 sequences. (Running on oeis4.)