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A215721 as a simple table

na(n)
10
21
35
49
515
621
725
829
935
1039
1143
1255
1359
1463
1573
1677
1789
1893
1997
20107
21111
22123
23127
24131
25141
26145
27157
28161
29165
30175
31179
32191
33195
34199
35209
36213
37225
38229
39233
40243
41247
42259
43263
44267
45277
46281
47293
48297
49301
50311
51315
52327
53331
54335
55345
56349
57361

[0,1,5,9,15,21,25,29,35,39,43,55,59,63,73,77,89, 93,97,107,111,123,127,131,141,145,157,161,165,175, 179,191,195,199,209,213,225,229,233,243,247,259, 263,267,277,281,293,297,301,311,315,327,331,335, 345,349,361]