A087333 - OEIS

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A087333 as a simple table

n	a(n)
1	3
2	13
3	3571
4	13577
5	135799
6	135791107
7	13579111307
8	1357911131503
9	13579111315171
10	135791113151719
11	1357911131517192157
12	13579111315171921231
13	35791113151719212325277
14	357911131517192123252729

[3,13,3571,13577,135799,135791107,13579111307, 1357911131503,13579111315171,135791113151719, 1357911131517192157,13579111315171921231, 35791113151719212325277,357911131517192123252729]