id:A153093 - OEIS Search Results

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Least k(n) such that k(n)*7^n*(7^n-1)+j is prime with j= -1 or 1 or both

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1, 1, 1, 2, 9, 1, 2, 1, 1, 5, 13, 1, 6, 1, 6, 14, 4, 4, 7, 5, 6, 5, 12, 3, 6, 3, 9, 3, 20, 9, 14, 7, 43, 22, 5, 11, 4, 4, 48, 14, 8, 56, 36, 7, 83, 47, 47, 1, 2, 74, 15, 12, 22, 15, 17, 47, 20, 20, 5, 8, 12, 26, 6, 26, 55, 16, 32, 45, 24, 46, 19, 58, 6, 29, 19, 26, 83, 45, 17, 48, 6, 16, 152 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`when n increases sum k(n) for i=1 to n / sum n for i=1 to n tends to log(7)/3.7`
	LINKS	`Pierre CAMI, Table of n, a(n) for n = 1..1000`
	EXAMPLE	`17^1(7^1-1)-1=41 prime as 43 so k(1)=1`
	CROSSREFS	`A152414, A152090, A152091, A152092, A152094, A152095` `Sequence in context: A085333 A128892 A105548 this_sequence A094242 A083649 A073009` `Adjacent sequences: A153090 A153091 A153092 this_sequence A153094 A153095 A153096`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)orange.fr), Dec 18 2008`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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