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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

%I

%S 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,

%T 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,

%U 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

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

%C 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.)

%Y Cf. A000217, A067186.

%K nonn

%O 1,1

%A _John W. Layman_, Oct 26 2007

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Last modified May 31 07:22 EDT 2020. Contains 334747 sequences. (Running on oeis4.)