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A176470 as a simple table

na(n)
15
217
353
4137
5173
6257
7677
81097
91193
101733
112237
122657
132957
144133
155297
165717
178573
188837
199377
2011093
2111393
2212953
2314957
2417477
2518233
2618617
2719793
2823537
2924413
3029033
3130497
3233533
3336713
3440037
3541177
3645293
3748353

[5,17,53,137,173,257,677,1097,1193,1733,2237,2657,
 2957,4133,5297,5717,8573,8837,9377,11093,11393,
 12953,14957,17477,18233,18617,19793,23537,24413,
 29033,30497,33533,36713,40037,41177,45293,48353]