

A087373


Twinprimeindexed primes (TWIPS): members of a pair of twin primes whose prime index is also a member of a pair of twin primes.


1



5, 11, 17, 31, 41, 59, 109, 179, 191, 283, 599, 859, 1063, 1153, 1723, 2081, 2341, 3001, 3259, 3299, 4421, 4549, 4787, 4933, 6361, 6661, 8221, 8233, 8389, 10009, 10457, 10861, 13693, 13709, 16141, 16693, 16901, 17387, 17659, 20441, 20477, 20773
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OFFSET

1,1


COMMENTS

If there are infinitely many twin primes, this sequence has an infinite number of terms.


LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000


EXAMPLE

17 is a twin prime paired with 19. The 17th prime is 59 which is also a twin prime paired with 61.


PROG

(PARI) twips(n) = { forprime(x=3, n, x1=prime(x); if(isprime(x2)  isprime(x+2), if(isprime(x12)  isprime(x1+2), print1(x1", ") ) ) ) }


CROSSREFS

Sequence in context: A136292 A088046 A155882 * A155030 A030468 A277290
Adjacent sequences: A087370 A087371 A087372 * A087374 A087375 A087376


KEYWORD

easy,nonn


AUTHOR

Cino Hilliard, Oct 21 2003


EXTENSIONS

Offset corrected by Amiram Eldar, Jan 09 2020


STATUS

approved



