A328637 Change the array in A125624 by putting a 1 at the top of the first column and pushing that column down by one place; a(n) is the sum of the terms in the modified array down to and including n, in the column that contains n.

1, 3, 6, 4, 11, 10, 18, 8, 17, 20, 29, 12, 42, 34, 32, 28, 59, 18, 78, 48, 53, 56, 101, 24, 43, 82, 27, 76, 130, 54, 161, 75, 86, 116, 110, 36, 198, 154, 125, 67, 239, 96, 282, 120, 81, 200, 329, 48, 116, 98, 176, 172, 382, 54, 165, 137, 233, 258, 441

Offset: 1

Author

J. Stauduhar, Oct 22 2019

Keywords

• nonn
• easy

Examples

			The modified version of the array A125624 is:
1,  4,  8, 16, 32, 64, 128, 256, 512, ...
2,  6,  9, 12, 18, 24,  27,  36,  48, ...
3, 10, 15, 20, 25, 30,  40,  45,  50, ...
5, 14, 21, 28, 35, 42,  49,  56,  63, ...
7, 22, 33, 44, 55, 66,  77,  88,  99, ...
11, 26, 39, 52, 65, 78,  91, 104, 117, ...
...
Then:
a(1) = 1,
a(2) = 1+2,
a(3) = 1+2+3,
a(4) = 4,
a(5) = 1+2+3+5,
a(6) = 4+6,
...
		

Links

• J. Stauduhar, Python program

Crossrefs

Cf. A125624, A328638.

Extensions

Edited by N. J. A. Sloane, Dec 05 2019