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Upper twin primes of upper twin prime index.
3

%I #14 Jan 01 2020 10:28:32

%S 31,61,181,283,811,1279,1999,2551,3931,4159,5659,6553,8389,9241,9463,

%T 11551,12253,14629,15889,17923,20509,26113,27109,29401,33829,37993,

%U 41179,42571,44623,46681,59671,61333,62143,65449,67759,81019,82009

%N Upper twin primes of upper twin prime index.

%H Amiram Eldar, <a href="/A088463/b088463.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = A006512(A006512(n)).

%F a(n) == 1 (mod 6).

%o (PARI) a(k) = { for(x1=1,k, y1=twinu(twinu(x1)); print1(y1", ") ) }

%o twin(n) = { c=0; x=1; while(c<n, if(isprime(prime(x)+2),c++); x++; ); return(prime(x)) }

%Y Cf. A006512, A088460, A007097.

%K nonn

%O 1,1

%A _Cino Hilliard_, Nov 12 2003

%E Edited by _David W. Wilson_, Oct 29 2006