id:A103356 - OEIS Search Results

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Least k such that k*((p(n)#)^2)-1 is prime with p(i)#=i-th primorial.

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1, 2, 3, 3, 6, 17, 13, 13, 5, 6, 2, 11, 14, 15, 3, 7, 77, 6, 20, 53, 52, 6, 13, 8, 41, 52, 24, 26, 31, 41, 5, 31, 21, 28, 43, 57, 11, 18, 47, 19, 8, 33, 24, 30, 43, 10, 17, 213, 29, 15, 45, 60, 50, 26, 48, 18, 18, 78, 8, 59, 13, 33, 145, 23, 154, 79, 65, 21, 18, 23, 30, 19, 159, 46, 45 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`12^2-1=3 prime so a(1)=1` `1((23)^2)-1=35 composite` `2((23)^2)-1=71 prime so a(2)=2` `1((235)^2)-1=899 composite` `2((235)^2)-1=1799 composite` `3((235)^2)-1=2699 prime so a(3)=3`
	CROSSREFS	`Sequence in context: A054630 A049875 A087989 this_sequence A028257 A100228 A111003` `Adjacent sequences: A103353 A103354 A103355 this_sequence A103357 A103358 A103359`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierrecami(AT)tele2.fr), Mar 20 2005`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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