A162619 Triangle read by rows in which row n lists n consecutive natural numbers A000027, starting with A014689(n) = A000040(n)-n.

1, 1, 2, 2, 3, 4, 3, 4, 5, 6, 6, 7, 8, 9, 10, 7, 8, 9, 10, 11, 12, 10, 11, 12, 13, 14, 15, 16, 11, 12, 13, 14, 15, 16, 17, 18, 14, 15, 16, 17, 18, 19, 20, 21, 22, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 25, 26, 27, 28, 29, 30, 31, 32, 33

Offset

1,3

Comments

Note that the last term of the n-th row is A000040(n)-1 = A006093(n).

See also A162618 and A162620.

Links

Table of n, a(n) for n=1..75.

Example

Triangle begins:
.1;
.1, 2;
.2, 3, 4;
.3, 4, 5, 6;
.6, 7, 8, 9,10;
.7, 8, 9,10,11,12;
10,11,12,13,14,15,16;
11,12,13,14,15,16,17,18;
14,15,16,17,18,19,20,21,22;
19,20,21,22,23,24,25,26,27,28;
20,21,22,23,24,25,26,27,28,29,30;

Crossrefs

Cf. A000040, A006093, A014689, A159797, A159798, A162611, A162618, A162620.

Sequence in context: A122872 A356998 A132919 * A259196 A357589 A336200

Adjacent sequences: A162616 A162617 A162618 * A162620 A162621 A162622

Keyword

easy,nonn,tabl

Author

Omar E. Pol, Jul 10 2009

Status

approved