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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A319035 Triangular numbers T(k) that have the same number of divisors as their successors T(k+1).

Table of values

n a(n)
1 6
2 10
3 15
4 66
5 153
6 406
7 435
8 561
9 861
10 903
11 1378
12 1540
13 1770
14 2211
15 2346
16 2556
17 2926
18 3655
19 3916
20 4186
21 4371
22 5151
23 5778
24 6555
25 7626
26 9453
27 10011
28 10296
29 11175
30 11325
31 12720
32 14535
33 14878
34 16110
35 16836
36 17205
37 17391
38 17766
39 18336
40 19306
41 19503
42 20301
43 20706

List of values

[6, 10, 15, 66, 153, 406, 435, 561, 861, 903, 1378, 1540, 1770, 2211, 2346, 2556, 2926, 3655, 3916, 4186, 4371, 5151, 5778, 6555, 7626, 9453, 10011, 10296, 11175, 11325, 12720, 14535, 14878, 16110, 16836, 17205, 17391, 17766, 18336, 19306, 19503, 20301, 20706]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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