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A171021
In the sequence of prime numbers, replace all the '4' digits with '2' and vice versa.
3
4, 3, 5, 7, 11, 13, 17, 19, 43, 49, 31, 37, 21, 23, 27, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 147, 131, 137, 139, 129, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 411, 443, 447, 449, 433, 439, 421, 451, 457, 463
OFFSET
1,1
LINKS
MATHEMATICA
FromDigits[IntegerDigits[#]/.{4->p, 2->q}/.{p->2, q->4}]&/@Prime[Range[100]] (* Vincenzo Librandi, Apr 07 2013 *)
PROG
(PARI) a(n)=my(v=[0, 1, 4, 3, 2, 5, 6, 7, 8, 9]); subst(Pol(apply(k->v[k+1], digits(prime(n)))), 'x, 10) \\ Charles R Greathouse IV, Jul 16 2013
CROSSREFS
Sequence in context: A304225 A068982 A317530 * A035427 A257120 A306835
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved