id:A082747 - OEIS Search Results

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Least k such that k*Mrs(n)*Mrs(n+1)*Mrs(n+2) +1 is prime with Mrs(i)=i-th Mersenne-prime.

+0
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2, 4, 6, 4, 60, 280, 60, 210, 306, 154, 538, 1272, 640, 4180, 6384 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`2(2^2-1)(2^3-1)*(2^5-1) +1 = 1303 prime so a(1)=2`
	CROSSREFS	`Sequence in context: A074320 A014428 A099784 this_sequence A127275 A071288 A063892` `Adjacent sequences: A082744 A082745 A082746 this_sequence A082748 A082749 A082750`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Oct 22 2004`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.