A343536 - cp's OEIS frontend

A343536 Positive numbers k such that the decimal expansion of k^2 appears in the concatenation of the first k positive integers.

n	a(n)
1	1
2	428
3	573
4	725
5	727
6	738
7	846
8	7810
9	8093
10	28023
11	36354
12	36365
13	36464
14	63636
15	254544
16	277851
17	297422
18	326734
19	673267
20	673368
21	2889810
22	4545454
23	4545465
24	5454547
25	5454646
26	24275425
27	29411775
28	47058823
29	52941178
30	94117748
31	146407310
32	263157795
33	267735365
34	285714186

[1, 428, 573, 725, 727, 738, 846, 7810, 8093, 28023, 36354, 36365, 36464, 63636, 254544, 277851, 297422, 326734, 673267, 673368, 2889810, 4545454, 4545465, 5454547, 5454646, 24275425, 29411775, 47058823, 52941178, 94117748, 146407310, 263157795, 267735365, 285714186]

cp's OEIS Frontend

A343536 Positive numbers k such that the decimal expansion of k^2 appears in the concatenation of the first k positive integers.

Table of values

List of values