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A256840 as a simple table

na(n)
120857
221577
321961
423761
527961
628657
729017
829761
930937
1033961
1134897
1237897
1341761
1442937
1549297
1651361
1760337
1862761
1965257
2080761
2183737
2293097
23107761
24111337
25113761
26122497
27132961
28142537
29151057
30164377
31173617
32181537
33188017
34192961
35218761

[20857,21577,21961,23761,27961,28657,29017,29761,
 30937,33961,34897,37897,41761,42937,49297,51361,
 60337,62761,65257,80761,83737,93097,107761,111337,
 113761,122497,132961,142537,151057,164377,173617,
 181537,188017,192961,218761]