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A056909 as a simple table

na(n)
17
231
3127
4367
5631
6967
71231
83727
94231
106247
117927
128287
1311887
1417167
1521031
1622807
1730631
1834231
1939607
2048847
2172367
22108247
23109567
24126031
25160807
26185767
27198031
28231367
29235231
30261127
31265231
32279847
33290527
34323767
35354031

[7,31,127,367,631,967,1231,3727,4231,6247,7927,
 8287,11887,17167,21031,22807,30631,34231,39607,
 48847,72367,108247,109567,126031,160807,185767,
 198031,231367,235231,261127,265231,279847,290527,
 323767,354031]