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”).

A273750 as a simple table

na(n)
01
15
213
321
437
545
677
785
8117
9125
10189
11197
12229
13269
14365
15341
16405
17413
18541
19549
20581
21685
22845
23757
24885
25893
261021
271157
281189
291293
301581
311365
321493
331501
341757
351765
361797
372029
382317
392101
402357
412365
422493
432885
442917
453021
463565
473093
483221

[1,5,13,21,37,45,77,85,117,125,189,197,229,269,
 365,341,405,413,541,549,581,685,845,757,885,893,
 1021,1157,1189,1293,1581,1365,1493,1501,1757,1765,
 1797,2029,2317,2101,2357,2365,2493,2885,2917,3021,
 3565,3093,3221]