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”).

A026426 as a simple table

na(n)
12
24
35
46
57
69
711
813
915
1017
1119
1221
1323
1427
1529
1631
1732
1833
1937
2039
2140
2241
2343
2447
2548
2650
2751
2853
2956
3057
3159
3261
3367
3469
3570
3671
3772
3873
3979
4083
4187
4288
4389
4493
4597
4698
47101
48103
49104
50107
51109
52110
53111
54113
55120
56123
57125
58127

[2,4,5,6,7,9,11,13,15,17,19,21,23,27,29,31,32,33,
 37,39,40,41,43,47,48,50,51,53,56,57,59,61,67,69,
 70,71,72,73,79,83,87,88,89,93,97,98,101,103,104,
 107,109,110,111,113,120,123,125,127]