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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”).

A140291 as a simple table

na(n)
11
23
37
49
513
615
731
837
951
1073
1199
12111
13115
14133
15141
16151

[1,3,7,9,13,15,31,37,51,73,99,111,115,133,141,151]