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A212820 as a simple table

na(n)
15
253
3173
4211
51511
63307
73637
84457
94993
106863
1111411
1211731
1311903
1412653
1515907
1618223
1720107
1820201
1920347
2020731
2122051
2223801
2326041
2435911
2539113
2640493
2746889
2847303
2951551
3052529
3160083
3263559
3369623
3471011
3575787
3677081
3778803
3885049
3991297

[5,53,173,211,1511,3307,3637,4457,4993,6863,11411,
 11731,11903,12653,15907,18223,20107,20201,20347,
 20731,22051,23801,26041,35911,39113,40493,46889,
 47303,51551,52529,60083,63559,69623,71011,75787,
 77081,78803,85049,91297]