A216555 - OEIS

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A216555 as a simple table

n	a(n)
1	0
2	5
3	7
4	8
5	13
6	16
7	31
8	37
9	47
10	53
11	61
12	71
13	79
14	503
15	613
16	863
17	7741
18	19469
19	81671
20	94823
21	344293
22	532277
23	631181
24	637751
25	651821

[0,5,7,8,13,16,31,37,47,53,61,71,79,503,613,863, 7741,19469,81671,94823,344293,532277,631181, 637751,651821]