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Smallest common difference of the arithmetic progression of length n, beginning with 1 whose product of first n terms + 1 is a prime.

+0
2

1, 1, 1, 3, 7, 5, 5, 5, 7, 7, 1, 7, 11, 3, 41, 15, 21, 25, 11, 3, 69, 5, 87, 35, 17, 27, 1, 27, 5, 9, 3, 53, 9, 21, 25, 9, 1, 57, 15, 19, 1, 21, 191, 19, 25, 149, 83, 23, 7, 121, 205, 133, 185, 39, 43, 23, 9, 9, 3, 257, 109, 25, 107, 65, 19, 43, 97, 115, 197, 89, 109, 55, 1, 161, 61 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`Obviously all the terms are odd.`
	EXAMPLE	`The arithmetic progression in triangular form:` `1` `1 2` `1 2 3` `1 4 7 10` `1 8 15 22 29` `1 8 15 22 29 36` `...`
	CROSSREFS	`Cf. A084727.` `Sequence in context: A141519 A029946 A021731 this_sequence A107738 A010624 A019638` `Adjacent sequences: A084723 A084724 A084725 this_sequence A084727 A084728 A084729`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), Jun 13 2003`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jan 03 2005`

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.

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