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A158405 as a triangular array

1
13
135
1357
13579
1357911
135791113
13579111315
1357911131517
135791113151719
13579111315171921
1357911131517192123

A158405 as a square array

111111111111
33333333333
5555555555
777777777
99999999
11111111111111
131313131313
1515151515
17171717
191919
2121
23

A158405 as an upper right triangle

111111111111
33333333333
5555555555
777777777
99999999
11111111111111
131313131313
1515151515
17171717
191919
2121
23

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Last modified August 4 17:04 EDT 2024. Contains 374923 sequences. (Running on oeis4.)