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A164682 as a simple table

na(n)
15
28
310
416
520
632
740
864
980
10128
11160
12256
13320
14512
15640
161024
171280
182048
192560
204096
215120
228192
2310240
2416384
2520480
2632768
2740960
2865536
2981920
30131072
31163840
32262144
33327680
34524288
35655360
361048576
371310720
382097152
392621440
404194304

[5,8,10,16,20,32,40,64,80,128,160,256,320,512,640,
 1024,1280,2048,2560,4096,5120,8192,10240,16384,
 20480,32768,40960,65536,81920,131072,163840,
 262144,327680,524288,655360,1048576,1310720,
 2097152,2621440,4194304]