id:A098920 - OEIS Search Results

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Least k such that k*M#(n) +1 is prime with M#(n)=product from 1 to n of Mersenne-primes.

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2, 2, 2, 6, 30, 10, 4, 26, 12, 10, 12, 436, 644, 424, 2164, 862, 408, 9558, 5226, 12350 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`2(2^2-1)(2^3-1)*(2^5-1) + 1 = 1303 prime so k(3)=2`
	CROSSREFS	`Adjacent sequences: A098917 A098918 A098919 this_sequence A098921 A098922 A098923` `Sequence in context: A058756 A007039 A025248 this_sequence A129365 A021453 A053789`
	KEYWORD	`hard,more,nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Oct 17 2004`
	EXTENSIONS	`a(15)-a(20) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 23 2008`

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Last modified October 13 09:05 EDT 2008. Contains 145008 sequences.