A162620 Triangle read by rows in which row n lists n consecutive natural numbers A000027, starting with A000040(n)-n+1.

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

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 the n-th prime A000040(n).

See also A162618 and A162619.

Examples

			Triangle begins:
.2;
.2, 3;
.3, 4, 5;
.4, 5, 6, 7;
.7, 8, 9,10,11;
.8, 9,10,11,12,13;
11,12,13,14,15,16,17;
12,13,14,15,16,17,18,19;
15,16,17,18,19,20,21,22,23;
20,21,22,23,24,25,26,27,28,29;
21,22,23,24,25,26,27,28,29,30,31;
		

Crossrefs

Cf. A000040, A159797, A159798, A162611, A162618, A162619.