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A087680 as a simple table

na(n)
17
29
315
427
533
657
763
875
993
10105
11135
12153
13177
14195
15237
16267
17273
18363
19393
20405
21435
22453
23483
24495
25567
26573
27597
28603
29657
30687
31705
32723
33747
34765
35825
36915
37933
38987
391017
401035
411065
421113
431167
441197
451227
461233
471287
481293
491323
501377
511443

[7,9,15,27,33,57,63,75,93,105,135,153,177,195,237,
 267,273,363,393,405,435,453,483,495,567,573,597,
 603,657,687,705,723,747,765,825,915,933,987,1017,
 1035,1065,1113,1167,1197,1227,1233,1287,1293,1323,
 1377,1443]