login

A210881 as a simple table

na(n)
11
21
33
43
54
64
74
87
95
107
115
129
1310
149
1511
166
1711
1813
1917
2014
2118
227
2313
2416
2522
2627
2723
2829
298
3015
3119
3227
3335
3444
3537
3647
379
3817
3922
4032
4143
4257
4371
4460
4576
4610
4719
4825
4937
5051
5170
5292
53115
5497
55123
5611
5721
5828
5942
6059
6183
62113
63149
64186
65157
66199
6712
6823
6931

[1,1,3,3,4,4,4,7,5,7,5,9,10,9,11,6,11,13,17,14,18,
 7,13,16,22,27,23,29,8,15,19,27,35,44,37,47,9,17,
 22,32,43,57,71,60,76,10,19,25,37,51,70,92,115,97,
 123,11,21,28,42,59,83,113,149,186,157,199,12,23,
 31]