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A232237 as a simple table

na(n)
15
27
331
4271
5283
6433
71291
81321
91429
101489
111951
124723
135503
146091
156133
166553
176871
1816651
1916981
2017029
2117191
2217209
2317749
2417791
2518541
2618919
2719471
2820149
2920479
3020551
3120809
3221319
3321649
3421739
3522111
3625309
3725801
3827061
3927409
4027541
4127691
4228549
4329131

[5,7,31,271,283,433,1291,1321,1429,1489,1951,4723,
 5503,6091,6133,6553,6871,16651,16981,17029,17191,
 17209,17749,17791,18541,18919,19471,20149,20479,
 20551,20809,21319,21649,21739,22111,25309,25801,
 27061,27409,27541,27691,28549,29131]