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A128388 as a simple table

na(n)
137
273
3337
4733
53257
63373
73527
83733
97253
107523
117577
127757
1332233
1432257
1532353
1632377
1732537
1833223
1935227
2035257
2135323
2235327
2335537
2472253
2572337
2672353
2772577
2873277
2973327
3073523
3173553
3275223
3375253
3475577
3577237
3677323

[37,73,337,733,3257,3373,3527,3733,7253,7523,7577,
 7757,32233,32257,32353,32377,32537,33223,35227,
 35257,35323,35327,35537,72253,72337,72353,72577,
 73277,73327,73523,73553,75223,75253,75577,77237,
 77323]