A134460 - OEIS

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A134460

First differences of A067186 (A067186 gives n such that 1+t(n) is prime, where t(n) is the n-th triangular number).

2, 1, 3, 1, 3, 1, 4, 3, 1, 3, 4, 8, 5, 3, 1, 3, 4, 5, 4, 3, 1, 4, 3, 4, 1, 8, 4, 7, 1, 3, 1, 7, 4, 1, 19, 1, 3, 5, 8, 11, 4, 4, 1, 4, 3, 4, 5, 3, 13, 3, 4, 1, 3, 8, 4, 5, 8, 4, 11, 9, 4, 7, 4, 5, 4, 4, 3, 4, 4, 8, 9, 4, 7, 16, 1, 4, 4, 7, 4, 1, 8, 3, 1, 11, 5, 4, 3, 9, 11, 1, 8, 3, 1, 4, 3, 1, 3, 4, 13, 4, 3, 8 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Conjecture. Except for the first term a(1)=2, this sequence does not contain terms of the form 4k+2. (This has been confirmed for the first several thousand terms.)`
	CROSSREFS	`Cf. A000217, A067186.` `Sequence in context: A082460 A029227 A029214 * A130158 A187497 A104984` `Adjacent sequences: A134457 A134458 A134459 * A134461 A134462 A134463`
	KEYWORD	`nonn`
	AUTHOR	`John W. Layman (layman(AT)math.vt.edu), Oct 26 2007`

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Last modified February 15 12:14 EST 2012. Contains 205783 sequences.