A290025 - cp's OEIS frontend

A290025 The partial sums of 2^d(n) where d(n) is the n-th digit of the concatenated triangular numbers, and d(1)=0.

n	a(n)
1	1
2	3
3	11
4	75
5	77
6	78
7	80
8	112
9	116
10	118
11	122
12	378
13	386
14	450
15	466
16	498
17	530
18	562
19	626
20	690
21	818
22	1074
23	1586
24	1588
25	1590
26	1591
27	1623
28	1625
29	1629
30	1630
31	1632
32	1640
33	1704
34	1706
35	1738
36	1746
37	1748
38	1876
39	1878
40	1880
41	2392
42	2393
43	2397
44	2399
45	2400
46	2404
47	2412
48	2414
49	2418
50	2450

[1, 3, 11, 75, 77, 78, 80, 112, 116, 118, 122, 378, 386, 450, 466, 498, 530, 562, 626, 690, 818, 1074, 1586, 1588, 1590, 1591, 1623, 1625, 1629, 1630, 1632, 1640, 1704, 1706, 1738, 1746, 1748, 1876, 1878, 1880, 2392, 2393, 2397, 2399, 2400, 2404, 2412, 2414, 2418, 2450]

cp's OEIS Frontend

A290025 The partial sums of 2^d(n) where d(n) is the n-th digit of the concatenated triangular numbers, and d(1)=0.

Table of values

List of values