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A020290 as a simple table

n a(n)
1 9
2 21
3 63
4 65
5 133
6 231
7 341
8 481
9 511
10 651
11 1387
12 1417
13 1541
14 1661
15 2047
16 2501
17 3171
18 3277
19 3641
20 4033
21 4097
22 4371
23 4681
24 5461
25 5963
26 6533
27 6951
28 7107
29 7161
30 8321
31 8911
32 9709
33 10261
34 11041
35 13333
36 13747
37 14491
38 14981
39 15709
40 15841
41 16589
42 19561
43 19951

[9,21,63,65,133,231,341,481,511,651,1387,1417,
 1541,1661,2047,2501,3171,3277,3641,4033,4097,4371,
 4681,5461,5963,6533,6951,7107,7161,8321,8911,9709,
 10261,11041,13333,13747,14491,14981,15709,15841,
 16589,19561,19951]

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Last modified July 13 22:24 EDT 2024. Contains 374288 sequences. (Running on oeis4.)