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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”).

A068871 as a simple table

na(n)
11
211
331
441
561
671
7101
8121
9131
10151
11181
12191
13211
14241
15251
16271
17281
18311
19331

[1,11,31,41,61,71,101,121,131,151,181,191,211,241,
 251,271,281,311,331]