A105433 Smallest prime dividing the composite number consisting of n 1's followed by a terminal 3, where n=A105432.

3, 23, 3, 13, 3, 461, 3, 13, 1163, 3, 19, 1077697, 3, 13, 29, 3, 31, 3, 13, 1297561, 3, 81703, 53, 3, 13, 1867, 3, 19, 6053, 3, 13, 163, 3, 1733, 1954503644062423429, 3, 13, 33142829, 3, 79, 24733371888243845161, 3, 13, 193367, 3, 19, 501654709, 3, 13

Offset

1,1

Links

Table of n, a(n) for n=1..49.

Makoto Kamada, Factorizations of 11...113.

Mathematica

FactorInteger[#][[1, 1]]&/@Select[Table[FromDigits[PadLeft[{3}, n, 1]], {n, 60}], !PrimeQ[#]&] (* Harvey P. Dale, Jun 04 2012 *)

Crossrefs

Sequence in context: A132558 A358288 A072113 * A196086 A196083 A285098

Adjacent sequences: A105430 A105431 A105432 * A105434 A105435 A105436

Keyword

nonn

Author

Lekraj Beedassy, Apr 08 2005

Status

approved