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A171030 In the sequence of prime numbers, replace all the '6' digits with '2' and vice versa. 3

%I

%S 6,3,5,7,11,13,17,19,63,69,31,37,41,43,47,53,59,21,27,71,73,79,83,89,

%T 97,101,103,107,109,113,167,131,137,139,149,151,157,123,127,173,179,

%U 181,191,193,197,199,611,663,667,669,633,639,641,651,657,623

%N In the sequence of prime numbers, replace all the '6' digits with '2' and vice versa.

%H Vincenzo Librandi, <a href="/A171030/b171030.txt">Table of n, a(n) for n = 1..1000</a>

%t FromDigits[IntegerDigits[#]/.{6->p, 2->q}/.{p->2, q->6}]&/@Prime[Range[100]] (* _Vincenzo Librandi_, Apr 07 2013 *)

%o (PARI) a(n)=my(v=[0,1,6,3,4,5,2,7,8,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ _Charles R Greathouse IV_, Jul 24 2013

%K nonn,base,easy

%O 1,1

%A _N. J. A. Sloane_ and _Vincenzo Librandi_, Sep 04 2010

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Last modified May 23 07:19 EDT 2022. Contains 353961 sequences. (Running on oeis4.)