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A251351 as a simple table

na(n)
151
2309
3309
41899
53921
61899
711709
850831
950831
1011709
1172243
12663307
131401453
14663307
1572243
16445797
178671957
1839019417
1939019417
208671957
21445797
222751003
23113445117
241089569635
252324761359
261089569635
27113445117
282751003
2916976493

[51,309,309,1899,3921,1899,11709,50831,50831,
 11709,72243,663307,1401453,663307,72243,445797,
 8671957,39019417,39019417,8671957,445797,2751003,
 113445117,1089569635,2324761359,1089569635,
 113445117,2751003,16976493]