login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A081309 as a simple table

na(n)
10
20
32
42
52
62
73
82
93
102
112
123
135
142
153
167
175
182
193
202
213
2213
235
2423
257
262
273
2819
292
303
317
325
3317
342
353
360
375
382
393
4013
415
4241
437
4417
4513
4619
4711
4847
4913
502
513
5243
535
5453
557
562
573
5831
595
6059
617
6253
6331
6437
6511
662
673
6841
695
7043
717
7271
7319
742
753
7667
775
780
797
8053
8117
8273
832
843
8513
865
8723
887
8917
9089

[0,0,2,2,2,2,3,2,3,2,2,3,5,2,3,7,5,2,3,2,3,13,5,
 23,7,2,3,19,2,3,7,5,17,2,3,0,5,2,3,13,5,41,7,17,
 13,19,11,47,13,2,3,43,5,53,7,2,3,31,5,59,7,53,31,
 37,11,2,3,41,5,43,7,71,19,2,3,67,5,0,7,53,17,73,2,
 3,13,5,23,7,17,89]