A139954 - OEIS

A139954 as a simple table

n	a(n)
1	31
2	59
3	199
4	251
5	311
6	419
7	619
8	691
9	719
10	839
11	859
12	971
13	1039
14	1259
15	1279
16	1291
17	1511
18	1571
19	1699
20	1879
21	1951
22	2099
23	2399
24	2539
25	2579
26	2819
27	2971
28	3191
29	3331
30	3359
31	3391
32	3491
33	3499
34	3631
35	3919
36	4051
37	4079
38	4339
39	4591
40	4651
41	4679
42	4871

[31,59,199,251,311,419,619,691,719,839,859,971, 1039,1259,1279,1291,1511,1571,1699,1879,1951,2099, 2399,2539,2579,2819,2971,3191,3331,3359,3391,3491, 3499,3631,3919,4051,4079,4339,4591,4651,4679,4871]

[31,59,199,251,311,419,619,691,719,839,859,971,
 1039,1259,1279,1291,1511,1571,1699,1879,1951,2099,
 2399,2539,2579,2819,2971,3191,3331,3359,3391,3491,
 3499,3631,3919,4051,4079,4339,4591,4651,4679,4871]