login

A214803 as a simple table

na(n)
1-1
2-1
31
4-1
55
6-1
73
87
911
10-1
1119
12-1
135
1411
1517
1623
1729
18-1
1913
2027
2141
22-1
237
2423
2531
2647
2755
28-1
2917
3053
3171
32-1
339
3419
3529
3639
3749
3859
3969
4079
4189
42-1
4343
4465
45109
46-1
4711
4823
4935
5047
5159
5271
5383
5495
55107
56119
57131
58-1
5925
6051
61103
62129
63155
64-1
6513

[-1,-1,1,-1,5,-1,3,7,11,-1,19,-1,5,11,17,23,29,-1,
 13,27,41,-1,7,23,31,47,55,-1,17,53,71,-1,9,19,29,
 39,49,59,69,79,89,-1,43,65,109,-1,11,23,35,47,59,
 71,83,95,107,119,131,-1,25,51,103,129,155,-1,13]