A277907 a(n) = A007310(A277908(n)).

5, 7, 11, 13, 17, 19, 41, 43, 59, 61, 67, 71, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 179, 181, 191, 193, 197, 199, 227, 229, 269, 271, 277, 281, 307, 311, 313, 317, 347, 349, 379, 383, 419, 421, 431, 433, 439, 443, 461, 463, 487, 491, 499, 503, 599, 601, 617, 619, 643, 647, 739, 743, 823, 827, 853, 857, 859, 863, 877, 881

Offset: 1

Author

Antti Karttunen, Nov 05 2016

Keywords

• nonn

Comments

It seems that all terms are primes, and moreover, that all those primes occur in pairs with distance of 2 or 4. However, not all terms of A001359 are present.

Links

• Antti Karttunen, Table of n, a(n) for n = 1..7096

Crossrefs

Cf. A000040, A001359, A007310, A118306, A277908, A277911.

Programs

Scheme

(define (A277907 n) (A007310 (A277908 n)))

Formula

a(n) = A007310(A277908(n)).