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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). 1
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; text; 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.)

LINKS

Table of n, a(n) for n=1..102.

CROSSREFS

Cf. A000217, A067186.

Sequence in context: A318573 A029227 A029214 * A130158 A187497 A325704

Adjacent sequences:  A134457 A134458 A134459 * A134461 A134462 A134463

KEYWORD

nonn

AUTHOR

John W. Layman, Oct 26 2007

STATUS

approved

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Last modified April 6 21:24 EDT 2020. Contains 333286 sequences. (Running on oeis4.)