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”).

A020628 as a simple table

na(n)
13
25
37
411
513
617
723
841
943
1053
1171
1279
1383
14127
15131
16151
17239
18251
19383
20691
21719
221151

[3,5,7,11,13,17,23,41,43,53,71,79,83,127,131,151,
 239,251,383,691,719,1151]