OFFSET
1,1
COMMENTS
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
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
PROG
(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
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Oct 13 2007
EXTENSIONS
More terms from Michel Marcus, Nov 07 2013
STATUS
approved