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A046416 Repunit of length a(n) has exactly 5 prime factors (counted with multiplicity). 0
6, 25, 29, 62, 89, 134, 137, 142, 151, 179, 239, 257, 271, 277, 289 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

P. De Geest, Repunits prime factors

Makoto Kamada, Factorizations of 11...11 (Repunit)

Eric Weisstein's World of Mathematics, Repunit

CROSSREFS

Cf. A000042, A001222, A002275, A004022, A004023, A046053.

Sequence in context: A074096 A126016 A237286 * A042879 A042495 A018198

Adjacent sequences:  A046413 A046414 A046415 * A046417 A046418 A046419

KEYWORD

nonn,base,more

AUTHOR

Patrick De Geest, Jul 15 1998

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

STATUS

approved

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Last modified June 20 10:13 EDT 2019. Contains 324234 sequences. (Running on oeis4.)