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A171043 In the sequence of prime numbers, replace all the '8' digits with '2' and vice versa. 3

%I #15 Mar 31 2017 00:53:53

%S 8,3,5,7,11,13,17,19,83,89,31,37,41,43,47,53,59,61,67,71,73,79,23,29,

%T 97,101,103,107,109,113,187,131,137,139,149,151,157,163,167,173,179,

%U 121,191,193,197,199,811,883,887,889,833,839,841,851,857,863

%N In the sequence of prime numbers, replace all the '8' digits with '2' and vice versa.

%H Vincenzo Librandi, <a href="/A171043/b171043.txt">Table of n, a(n) for n = 1..1000</a>

%t FromDigits[IntegerDigits[#]/.{8->p,2->q}/.{p->2,q->8}]&/@ Prime[ Range[60]] (* _Harvey P. Dale_, Nov 30 2011 *)

%o (PARI) a(n)=my(v=[0,1,8,3,4,5,6,7,2,9]);subst(Pol(apply(k->v[k+1], digits(prime(n)))),'x,10) \\ _Charles R Greathouse IV_, Jul 26 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 March 29 09:32 EDT 2024. Contains 371268 sequences. (Running on oeis4.)