id:A153090 - OEIS Search Results

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Least k(n) such that k(n)*3^n*(3^n-1)+j is prime with j= -1 or 1 or both

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1, 1, 1, 1, 3, 1, 1, 14, 5, 5, 5, 1, 7, 6, 5, 7, 12, 1, 5, 1, 6, 29, 23, 20, 8, 6, 23, 9, 2, 15, 18, 19, 13, 57, 1, 1, 9, 10, 15, 16, 22, 12, 26, 5, 5, 6, 39, 41, 6, 9, 50, 6, 32, 20, 4, 8, 2, 79, 28, 23, 33, 78, 31, 35, 19, 32, 46, 7, 6, 116, 39, 18, 20, 6, 35, 8, 25, 39, 31, 26, 117, 19 (list; graph; listen)

	OFFSET	`1,5`
	COMMENT	`when n increases sum k(n) for i=1 to n / sum n for i=1 to n tends to 2*log(3)/7`
	LINKS	`Pierre CAMI, Table of n, a(n) for n = 1..2000`
	EXAMPLE	`13^1(3^1-1)-1=5 prime as 7 so k(1)=1 13^2(3^2-1)-1=71 prime as 73 so k(2)=1`
	CROSSREFS	`A152414, A152091, A152092, A152093, A152094, A152095` `Sequence in context: A055154 A015112 A156869 this_sequence A073483 A006956 A072285` `Adjacent sequences: A153087 A153088 A153089 this_sequence A153091 A153092 A153093`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)orange.fr), Dec 18 2008`

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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

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