A162621 Triangle read by rows in which row n lists n consecutive natural numbers A000027, starting with A014689(n+1) = A000040(n+1)-n-1.

1, 2, 3, 3, 4, 5, 6, 7, 8, 9, 7, 8, 9, 10, 11, 10, 11, 12, 13, 14, 15, 11, 12, 13, 14, 15, 16, 17, 14, 15, 16, 17, 18, 19, 20, 21, 19, 20, 21, 22, 23, 24, 25, 26, 27, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 25, 26, 27, 28, 29, 30, 31, 32, 33, 33, 34, 35, 28, 29, 30, 31, 32, 33, 34

Offset: 1

Author

Omar E. Pol, Jul 10 2009

Keywords

• easy
• nonn
• tabl

Comments

Note that the last term of the n-th row is A000040(n+1)-2 = A040976(n+1).

See also A162618, A162619 and A162620.

Examples

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

Crossrefs

Cf. A000040, A014689, A040976, A159797, A159798, A162611, A162618, A162619, A162620.