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A346706 as a simple table

na(n)
15
217
341
4197
5281
638921
7121631
8325019
9642869
10681257
111005551
121086557
132327399
144975457
157584569
167819787
178130767
188522159
1914848187
2017769377
2118615677
2219949537
2320144051
2421171191
2524845207
2633669047
2735166449
2856039957
2973479947
3082366769
3192731367

[5,17,41,197,281,38921,121631,325019,642869,
 681257,1005551,1086557,2327399,4975457,7584569,
 7819787,8130767,8522159,14848187,17769377,
 18615677,19949537,20144051,21171191,24845207,
 33669047,35166449,56039957,73479947,82366769,
 92731367]