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

1,1

Comments

There are only 9 composites 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

Table of n, a(n) for n=1..43.

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.

Sequence in context: A123860 A122817 A074764 * A138887 A216845 A031949

Adjacent sequences: A101084 A101085 A101086 * A101088 A101089 A101090

Keyword

nonn

Author

Gerard P. Michon, Dec 01 2004

Status

approved