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A038475 as a simple table

na(n)
131
2131
3151
4155
5631
6651
7655
8751
9755
10775
113131
123151
133155
143251
153255
163275
173751
183755
193775
203875
2115631
2215651
2315655
2415751
2515755
2615775
2716251
2816255
2916275
3016375
3118751
3218755
3318775
3418875
3519375
3678131
3778151
3878155
3978251
4078255
4178275
4278751

[31,131,151,155,631,651,655,751,755,775,3131,3151,
 3155,3251,3255,3275,3751,3755,3775,3875,15631,
 15651,15655,15751,15755,15775,16251,16255,16275,
 16375,18751,18755,18775,18875,19375,78131,78151,
 78155,78251,78255,78275,78751]