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A306973 as a simple table

na(n)
13
25
39
417
519
631
733
861
976
1055
11127
12199
13536
14577
15721
16962
171025
181126
191249
201324
212049
222402
232501
244801
256049
267687
278191
289801
2910657
3011775
3113719
3220457
3331370
3433281
3536449
3637537
3740897
3842049
3945124
4046817
4156447
4262423
4383751
4487724
4597499
46126001

[3,5,9,17,19,31,33,61,76,55,127,199,536,577,721,
 962,1025,1126,1249,1324,2049,2402,2501,4801,6049,
 7687,8191,9801,10657,11775,13719,20457,31370,
 33281,36449,37537,40897,42049,45124,46817,56447,
 62423,83751,87724,97499,126001]