A144676 Primes in A090831.

2, 7, 1409, 52021, 3468667

Offset

1,1

Comments

The next term A090831(242) ~ 9.7 * 10^457 is too large to be displayed here. See the indices in A144675.

Links

Amiram Eldar, Table of n, a(n) for n = 1..6

Formula

a(n) = A090831(A144675(n)).

Prog

(PARI) for( n=1, 999, /* n%10|print1([n]); */ isprime( p=sum( i=1, n, prime(i)^(n+1-i))) & print1(p", "))

Crossrefs

Cf. A090831, A144675.

Sequence in context: A082891 A000653 A128847 * A123180 A138198 A358482

Adjacent sequences: A144673 A144674 A144675 * A144677 A144678 A144679

Keyword

nonn,hard

Author

M. F. Hasler, Feb 02 2009, Feb 16 2009

Extensions

a(1) = 2 inserted by Amiram Eldar, Jul 21 2025

Status

approved