login

A144567 as a simple table

na(n)
15
27
35
45
57
613
75
87
919
105
117
1213
135
147
155
1631
177
1813
1919
205
217
2243
2313
247
255
267
2719
285
2913
3031
3161
327
3313
3419
3573
365
377
3813
397
405
4143
4219
4331
4413
457
465
4713
487
49103
5019
51109
525
5313
5431
5561
5619
577
5813
5943
607
6113
627
6319
64139
6573
665
6731
68151
697
7019
7113
727
735
7443
7513
7619
7731
7813
7961
80181
817

[5,7,5,5,7,13,5,7,19,5,7,13,5,7,5,31,7,13,19,5,7,
 43,13,7,5,7,19,5,13,31,61,7,13,19,73,5,7,13,7,5,
 43,19,31,13,7,5,13,7,103,19,109,5,13,31,61,19,7,
 13,43,7,13,7,19,139,73,5,31,151,7,19,13,7,5,43,13,
 19,31,13,61,181,7]