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A171038 In the sequence of prime numbers, replace all the '7' digits with '4' and vice versa. 3
2, 3, 5, 4, 11, 13, 14, 19, 23, 29, 31, 34, 71, 73, 74, 53, 59, 61, 64, 41, 43, 49, 83, 89, 94, 101, 103, 104, 109, 113, 124, 131, 134, 139, 179, 151, 154, 163, 164, 143, 149, 181, 191, 193, 194, 199, 211, 223, 224, 229, 233, 239, 271, 251, 254, 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

fixp[n_]:=FromDigits[IntegerDigits[n]/.{7->a, 4->b}/.{a->4, b->7}]; fixp/@Prime[Range[100]] (* Harvey P. Dale, Apr 25 2011 *)

PROG

(PARI) a(n)=my(v=[0, 1, 2, 3, 7, 5, 6, 4, 8, 9]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 25 2013

CROSSREFS

Sequence in context: A302849 A193971 A258861 * A023395 A316655 A318848

Adjacent sequences:  A171035 A171036 A171037 * A171039 A171040 A171041

KEYWORD

nonn,base,easy

AUTHOR

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

STATUS

approved

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Last modified April 25 11:43 EDT 2019. Contains 322456 sequences. (Running on oeis4.)