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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”).

A147133 as a simple table

na(n)
11
21
31
41
51
61
71
81
917
1017
1157
1257
13277
14277
152295
162295
1739117
1839117
191059135
201059135
2128274373

[1,1,1,1,1,1,1,1,17,17,57,57,277,277,2295,2295,
 39117,39117,1059135,1059135,28274373]