A247890 - OEIS

A247890 as a simple table

n	a(n)
1	1
2	3
3	7
4	13
5	21
6	31
7	43
8	57
9	73
10	91
11	111
12	133
13	157
14	183
15	211
16	241
17	273
18	307
19	343
20	381
21	421
22	464
23	508
24	554
25	602
26	652
27	704
28	758
29	814
30	872
31	932
32	994
33	1058
34	1124
35	1192
36	1262
37	1334
38	1408
39	1484
40	1562
41	1642
42	1724
43	1808
44	1895
45	1983
46	2073
47	2165
48	2259
49	2355
50	2453
51	2553
52	2655
53	2759
54	2865

[1,3,7,13,21,31,43,57,73,91,111,133,157,183,211, 241,273,307,343,381,421,464,508,554,602,652,704, 758,814,872,932,994,1058,1124,1192,1262,1334,1408, 1484,1562,1642,1724,1808,1895,1983,2073,2165,2259, 2355,2453,2553,2655,2759,2865]