

A095415


Length of repunits of which the prime factordigitexcess computed by A095414 equals 0.


3



2, 3, 5, 7, 9, 11, 13, 17, 19, 23, 27, 31, 47, 59, 67, 71, 83, 113, 127, 139, 163, 197, 211, 229, 251, 263, 311, 317
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OFFSET

1,1


COMMENTS

A004023 is a subsequence. 347, 421, 457, 461, 541, 701, 857 are also terms. Conjecture: Except for the number 4, A046413 is a subsequence. Conjecture: except for the prime powers 9 and 27, all terms are prime.  Chai Wah Wu, Nov 03 2019


LINKS

Table of n, a(n) for n=1..28.


FORMULA

Solutions to A095414(x)=0.


MATHEMATICA

d[1] = 1; d[n_] := Total[ IntegerLength /@ First /@ FactorInteger[(10^n  1)/9]]  n; Select[ Range[67], d[#] == 0 &] (* Giovanni Resta, Jul 16 2018 *)


CROSSREFS

Cf. A002275, A004023, A095370, A095407, A095413A095418.
Sequence in context: A070566 A325623 A136327 * A326149 A301987 A316857
Adjacent sequences: A095412 A095413 A095414 * A095416 A095417 A095418


KEYWORD

nonn,more,base


AUTHOR

Labos Elemer, Jun 22 2004


EXTENSIONS

Data corrected and extended by Giovanni Resta, Jul 16 2018


STATUS

approved



