login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A147233 as a simple table

na(n)
11
21
31
41
51
61
71
81
917
1017
1165
1265
13377
14377
154203
164203
1788657
1888657
192446623
202446623
2184129749
2284129749

[1,1,1,1,1,1,1,1,17,17,65,65,377,377,4203,4203,
 88657,88657,2446623,2446623,84129749,84129749]