A046416 Repunit of length a(n) has exactly 5 prime factors (counted with multiplicity).
6, 25, 29, 62, 89, 134, 137, 142, 151, 179, 239, 257, 271, 277, 289
Offset: 1
Links
- P. De Geest, Repunits prime factors
- Makoto Kamada, Factorizations of 11...11 (Repunit)
- Eric Weisstein's World of Mathematics, Repunit
Extensions
More terms from Robert Gerbicz, Nov 22 2010
a(14) by Bo Gyu Jeong, Jun 30 2012
a(15) from Ray Chandler, Apr 23 2017