A095416 Length of smallest repunit of which the prime factor-digit-excess computed by A095414 equals n.

2, 4, 6, 12, 24, 32, 30, 80, 96, 60, 84, 126, 120, 200, 168, 264, 210, 252

Offset

0,1

Comments

a(18), a(19) > 322. a(20) = 300. - Giovanni Resta, Jul 19 2018

a(A095371(n)-1) >= A328899(n). a(18) <= 440, a(19) <= 336, a(21) <= 624, a(22) <= 560, a(23) <= 480, a(24) <= 540, a(25) <= 720, a(26) <= 612, a(27) <= 420, a(28) <= 600, a(30) = 1050, a(31) <= 660, a(32) <= 1400, a(33) <= 900, a(34) <= 1020, a(35) <= 1500, a(36) <= 1380, a(37) <= 840, a(48) <= 1260, a(50) <= 1680. - Chai Wah Wu, Nov 03 2019

Links

Table of n, a(n) for n=0..17.

Formula

a(n) = Min{x; A095414(x)=n}.

Example

n=60: concatenated p-set for 60th-repunit is:
371113313741611012112412712161354190919901279612906161418890139526741,
its length=69, so excess=9, 60 is the smallest such repunit

Crossrefs

Cf. A002275, A095370, A095407, A095413-A095418.

Sequence in context: A282472 A346016 A368252 * A056795 A141420 A141551

Adjacent sequences: A095413 A095414 A095415 * A095417 A095418 A095419

Keyword

nonn,base,more

Author

Labos Elemer, Jun 22 2004

Extensions

Edited by Charles R Greathouse IV, Aug 03 2010

Data corrected and extended by Giovanni Resta, Jul 19 2018

a(0) from Chai Wah Wu, Nov 03 2019

Status

approved