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A100964 as a simple table

na(n)
13
27
323
489
5113
6113
7113
8523
9523
10887
111129
121327
131327
141327
151327
161327
171327
189551
1915683
2015683
2115683
2215683
2319609
2419609
2519609
2619609
2731397
2831397
2931397
3031397
3131397
3231397
3331397
3431397
3531397
3631397
37155921
38155921
39155921
40155921

[3,7,23,89,113,113,113,523,523,887,1129,1327,1327,
 1327,1327,1327,1327,9551,15683,15683,15683,15683,
 19609,19609,19609,19609,31397,31397,31397,31397,
 31397,31397,31397,31397,31397,31397,155921,155921,
 155921,155921]