A153093 - OEIS

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A153093

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

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; refs; listen; history; internal format)

	OFFSET	`1,4`
	COMMENTS	`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: A187556 A198103 A105548 * A094242 A199381 A083649` `Adjacent sequences: A153090 A153091 A153092 * A153094 A153095 A153096`
	KEYWORD	`nonn`
	AUTHOR	`Pierre CAMI (pierre-cami(AT)bbox.fr), Dec 18 2008`

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Last modified February 14 07:54 EST 2012. Contains 205599 sequences.