A125549 Composite Kummer numbers: -1 + product of first n consecutive primes (A057588).

209, 510509, 9699689, 223092869, 6469693229, 200560490129, 7420738134809, 13082761331670029, 614889782588491409, 32589158477190044729, 1922760350154212639069, 117288381359406970983269

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..338

Prog

(Magma) [a: n in [2..20]| not IsPrime(a) where a is -1+&*[NthPrime(k):k in [1..n]]]; // Marius A. Burtea, Feb 18 2020

Crossrefs

Cf. A057588, A066576 (composite Euclid numbers).

Sequence in context: A265682 A071379 A283153 * A104876 A349944 A259916

Adjacent sequences: A125546 A125547 A125548 * A125550 A125551 A125552

Keyword

nonn

Author

Artur Jasinski, Jan 01 2007

Extensions

Edited by Klaus Brockhaus, Jan 11 2007

Status

approved