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A180471 as a simple table

na(n)
531
6257
773
889
9683
10113
1111
12151
13331
1473
15109
1661681
17127
18337
195419
20178481
212796203
22157
231613
24233
251103
262089
273033169
281321
2920857
30599479
31281
3286171
33122921
3419
3537
36109
37433
3838737
392731
408191
41121369
4222366891
4313367
44164511353
458831418697
4623
47353
48397
49683
502113
512931542417

[31,257,73,89,683,113,11,151,331,73,109,61681,127,
 337,5419,178481,2796203,157,1613,233,1103,2089,
 3033169,1321,20857,599479,281,86171,122921,19,37,
 109,433,38737,2731,8191,121369,22366891,13367,
 164511353,8831418697,23,353,397,683,2113,
 2931542417]