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A171053 In the sequence of prime numbers, replace all the '9' digits with '4' and vice versa. 3
2, 3, 5, 7, 11, 13, 17, 14, 23, 24, 31, 37, 91, 93, 97, 53, 54, 61, 67, 71, 73, 74, 83, 84, 47, 101, 103, 107, 104, 113, 127, 131, 137, 134, 194, 151, 157, 163, 167, 173, 174, 181, 141, 143, 147, 144, 211, 223, 227, 224, 233, 234, 291, 251, 257, 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, 4 -> q} /. {p -> 4, q -> 9}] & /@ Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)

PROG

(PARI) a(n)=my(v=[0, 1, 2, 3, 9, 5, 6, 7, 8, 4]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 31 2013

CROSSREFS

Sequence in context: A308505 A249823 A171049 * A171055 A117285 A100546

Adjacent sequences:  A171050 A171051 A171052 * A171054 A171055 A171056

KEYWORD

nonn,base,easy

AUTHOR

N. J. A. Sloane and Vincenzo Librandi, Sep 04 2010

STATUS

approved

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Last modified April 1 10:33 EDT 2020. Contains 333159 sequences. (Running on oeis4.)