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 A179024 Primes whose only prime digits are 2's. 2
 2, 29, 211, 229, 241, 269, 281, 421, 821, 829, 929, 1021, 1129, 1201, 1229, 1249, 1289, 1291, 1429, 1621, 2011, 2029, 2069, 2081, 2089, 2099, 2111, 2129, 2141, 2161, 2221, 2269, 2281, 2411, 2441, 2609, 2621, 2689, 2699, 2801, 2819, 2861, 2909, 2969, 2999 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS At least one digit 2 is required. - Robert Israel, Jul 10 2018 A179025 is a proper subsequence. - Jianing Song, Jul 10 2018 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE Digs:= [0, 1, 2, 4, 6, 8, 9]: f:= proc(n) local L, x;   L:= convert(n, base, 7);   if not member(2, L) then return NULL fi;   x:= add(Digs[L[i]+1]*10^(i-1), i=1..nops(L));   if isprime(x) then x fi end proc: map(f, [\$1..2000]); # Robert Israel, Jul 10 2018 CROSSREFS Cf. A179025. Sequence in context: A137625 A132412 A009772 * A179025 A244599 A261268 Adjacent sequences:  A179021 A179022 A179023 * A179025 A179026 A179027 KEYWORD nonn,base AUTHOR Lekraj Beedassy, Jun 25 2010 EXTENSIONS Corrected by Ray Chandler, Jul 13 2010 STATUS approved

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Last modified October 23 17:32 EDT 2019. Contains 328373 sequences. (Running on oeis4.)