A134197 - OEIS

%I #17 Mar 19 2020 04:21:38

%S 3,7,13,23,31,47,61,73,89,103,113,131,139,151,167,181,193,199,233,241,

%T 271,293,317,337,359,389,409,421,433,449,467,491,509,523,547,577,601,

%U 619,647,661,691,709,743,761,773,797,811,823,839,863,887,919,941,953

%N Primes that occur in A126990 twice.

%C It seems, as tested up to prime(100000), that triplicates of primes do not occur in A126990, so this sequence stays the same if defined as either "... in A126990 exactly twice" or "... in A126990 at least twice." - _Michel Marcus_ and _R. J. Mathar_, Nov 07 2013

%H Amiram Eldar, <a href="/A134197/b134197.txt">Table of n, a(n) for n = 1..10000</a>

%o (PARI) lista(nn) = {last = A126990(1); for (n=2, nn, new = A126990(n); if (new == last, print1(new, ", ")); last = new;);} \\ _Michel Marcus_, Nov 07 2013

%Y Cf. A126990, A134196.

%K nonn

%O 1,1

%A _Artur Jasinski_, Oct 13 2007

%E More terms from _Michel Marcus_, Nov 07 2013