1,2

Table of n, a(n) for n=1..56.

(2*n^6+6*n^5+5*n^4-n^2+6)/6 is prime.

Sum(k=1,2,2k^5)+1 = 2*1^5+2*2^5 + 1 = 67 is a prime so 2 belongs to the sequence.

A091872 gives corresponding primes.

Sequence in context: A030334 A338807 A020676 * A289146 A294374 A066550

Adjacent sequences: A086675 A086676 A086677 * A086679 A086680 A086681

nonn,easy

Yalcin Aktar, Jul 28 2003

More terms from Ray Chandler, Aug 07 2003

approved