A102629 - OEIS

This site is supported by donations to The OEIS Foundation.

A102629

a(n)= least k such that (10^k)*Mersenne-prime(n) + 1 is prime.

1, 1, 1, 4, 2, 3, 10, 6, 28, 12, 45, 23, 36, 18, 114, 72, 652, 47, 39, 61, 3713, 208 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	COMMENTS	`Primes certified using PFGW from Primeform group`
	EXAMPLE	`(10^1)(2^5-1)+1=1031+1=311 prime, 2^5-1=Mersenne-prime(3) so a(3)=1`
	CROSSREFS	`Sequence in context: A143051 A120240 A179394 * A082361 A082363 A026177` `Adjacent sequences: A102626 A102627 A102628 * A102630 A102631 A102632`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)bbox.fr), Feb 01 2005`

Content is available under The OEIS End-User License Agreement .

Last modified February 17 00:09 EST 2012. Contains 205978 sequences.