A037125 Irregular triangle: row n is 1, 2, 3, 4, .., prime(n).

1, 2, 1, 2, 3, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 6, 7, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 1, 2, 3, 4, 5, 6, 7, 8, 9

Offset

1,2

Links

Table of n, a(n) for n=1..86.

Example

From Omar E. Pol, May 29 2012: (Start)
Written as an irregular triangle the sequence begins:
1, 2;
1, 2, 3;
1, 2, 3, 4, 5;
1, 2, 3, 4, 5, 6, 7;
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11;
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13;
Row n has length A000040(n). (End)

Mathematica

Flatten@Range@Prime@Range[9] (* Arkadiusz Wesolowski, Jul 02 2012 *)

Crossrefs

Cf. A002260.

Sequence in context: A194844 A138528 A364604 * A194055 A194029 A162192

Adjacent sequences: A037122 A037123 A037124 * A037126 A037127 A037128

Keyword

nonn,easy,tabf

Author

Vasiliy Danilov (danilovv(AT)usa.net), Jun 15 1998

Status

approved