login

A228520 as a simple table

na(n)
12
23
311
416
523
641
747
859
967
1071
1179
12101
13107
14109
15127
16149
17167
18169
19179
20181
21227
22229
23233
24239
25256
26263
27269
28281
29283
30307
31347
32349
33359
34367
35373
36401
37409
38419
39431
40433
41439
42461
43487
44491
45521
46569
47587
48593
49599
50601
51607
52617
53641
54643
55647

[2,3,11,16,23,41,47,59,67,71,79,101,107,109,127,
 149,167,169,179,181,227,229,233,239,256,263,269,
 281,283,307,347,349,359,367,373,401,409,419,431,
 433,439,461,487,491,521,569,587,593,599,601,607,
 617,641,643,647]