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

1,2

Links

Table of n, a(n) for n=1..59.

J. Stauduhar, Python program

Example

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,
...

Crossrefs

Cf. A125624, A328638.

Sequence in context: A169846 A169854 A098383 * A162523 A292681 A299211

Adjacent sequences: A328634 A328635 A328636 * A328638 A328639 A328640

Keyword

nonn,easy

Author

J. Stauduhar, Oct 22 2019

Extensions

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

Status

approved