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”).

A280744 as a simple table

na(n)
11
22
33
45
56
68
79
812
913
1015
1119
1221
1325
1427
1532
1638
1740
1847
1953
2064
2167
2269
2373
2486
2590
2699
27107
28114
29131
30189
31290
32304
33311
34354
35366
36387
37435
38520
39553
40563
41598
42817
43885
441333
451361
461615
471634
481651
491655
501765
511776
522031
532068
542248
552261
562314
572700
582704
592712
602993
613128
623670

[1,2,3,5,6,8,9,12,13,15,19,21,25,27,32,38,40,47,
 53,64,67,69,73,86,90,99,107,114,131,189,290,304,
 311,354,366,387,435,520,553,563,598,817,885,1333,
 1361,1615,1634,1651,1655,1765,1776,2031,2068,2248,
 2261,2314,2700,2704,2712,2993,3128,3670]