A118103 First differences contain a(n) n's, in order, starting with a(0)=1.

1, 1, 2, 4, 6, 9, 12, 15, 18, 22, 26, 30, 34, 38, 42, 47, 52, 57, 62, 67, 72, 77, 82, 87, 93, 99, 105, 111, 117, 123, 129, 135, 141, 147, 153, 159, 166, 173, 180, 187, 194, 201, 208, 215, 222, 229, 236, 243, 250, 257, 264, 272, 280, 288, 296, 304, 312, 320, 328, 336

Offset

0,3

Comments

a(261) = 2701 = a(260) + 15 is the first case where a(n) is relatively prime to the difference (a(n)-a(n-1)) when that difference is composite; a(263) = 2731 is the first prime in the sequence with a composite difference.

Links

Charlie Neder, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A001462, A100143, A108104.

Sequence in context: A083652 A296349 A325544 * A337134 A185601 A157795

Adjacent sequences: A118100 A118101 A118102 * A118104 A118105 A118106

Keyword

nonn

Author

Franklin T. Adams-Watters, Apr 12 2006

Status

approved