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 A261182 Primes that contain only the digits (2, 7, 9). 2
 2, 7, 29, 79, 97, 227, 229, 277, 727, 797, 929, 977, 997, 2297, 2729, 2777, 2797, 2927, 2999, 7229, 7297, 7727, 7927, 9227, 9277, 9929, 22229, 22277, 22279, 22727, 22777, 27277, 27299, 27779, 27799, 27997, 29297, 29927, 72227, 72229, 72277, 72727, 72797 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A020459, A020460 and A020471 are subsequences. LINKS Chai Wah Wu, Table of n, a(n) for n = 1..1000 MATHEMATICA Select[Prime[Range[2 10^4]], Complement[IntegerDigits[#], {2, 7, 9}] == {} &] PROG (MAGMA) [p: p in PrimesUpTo(2*10^5) | Set(Intseq(p)) subset [2, 7, 9]]; (Python) from gmpy2 import is_prime from itertools import product A261182_list = [int(''.join(d)) for l in range(1, 10) for d in product('279', repeat=l) if is_prime(int(''.join(d)))] # Chai Wah Wu, Aug 11 2015 CROSSREFS Cf. similar sequences listed in A261181. Cf. A000040, A020459, A020460, A020471. Sequence in context: A158024 A166940 A166939 * A155186 A203969 A199581 Adjacent sequences:  A261179 A261180 A261181 * A261183 A261184 A261185 KEYWORD nonn,easy,base AUTHOR Vincenzo Librandi, Aug 11 2015 STATUS approved

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Last modified October 17 11:26 EDT 2019. Contains 328108 sequences. (Running on oeis4.)