A101087 Indices of prime values of A077020 (also A001607).

4, 6, 7, 8, 9, 10, 11, 15, 17, 19, 23, 25, 26, 29, 31, 47, 53, 65, 67, 71, 73, 113, 127, 199, 257, 349, 421, 433, 449, 691, 761, 823, 991, 1237, 1277, 1399, 1531, 1571, 3461, 3697, 4933, 6199, 7351

Offset: 1

Author

Gerard P. Michon, Dec 01 2004

Keywords

• nonn

Comments

There are only 9 composite numbers in the entire sequence, namely: 4, 6, 8, 9, 10, 15, 25, 26 and 65.

If we are prepared to accept probable primes, then the sequence continues as follows: 9551, 9719, 11681, 12037, 14629, 14951, 19079, 20327, 22549, 30517, 51511, 52813, 60923, 73943, 79687, 91249, 115321, 117017, 169493, 172411, 174413, 237053, 285631, 318751, 327433. - David Broadhurst, May 23 2007

Links

• G. P. Michon, Never Back to -1.

Crossrefs

Cf. A001607, A077020 (all values) and A101088 (prime values only). Similar to A001605 (Fibonacci primes), A000043 (Mersenne primes), A096650 (Pell primes), etc.