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 A171056 In the sequence of prime numbers, replace all the '9' digits with '7' and vice versa. 3
 2, 3, 5, 9, 11, 13, 19, 17, 23, 27, 31, 39, 41, 43, 49, 53, 57, 61, 69, 91, 93, 97, 83, 87, 79, 101, 103, 109, 107, 113, 129, 131, 139, 137, 147, 151, 159, 163, 169, 193, 197, 181, 171, 173, 179, 177, 211, 223, 229, 227, 233, 237, 241, 251, 259, 263 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA FromDigits[IntegerDigits[#] /. {9 -> p, 7 -> q} /. {p -> 7, q -> 9}] & /@ Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *) PROG (PARI) a(n)=my(v=[0, 1, 2, 3, 4, 5, 6, 9, 8, 7]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 31 2013 CROSSREFS Sequence in context: A078645 A067139 A014657 * A161514 A215779 A140329 Adjacent sequences:  A171053 A171054 A171055 * A171057 A171058 A171059 KEYWORD nonn,base,easy AUTHOR N. J. A. Sloane and Vincenzo Librandi, Sep 04 2010 STATUS approved

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Last modified January 19 06:37 EST 2020. Contains 331033 sequences. (Running on oeis4.)