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A075842 n 1's followed by n. 1
11, 112, 1113, 11114, 111115, 1111116, 11111117, 111111118, 1111111119, 111111111110, 1111111111111, 11111111111112, 111111111111113, 1111111111111114, 11111111111111115, 111111111111111116, 1111111111111111117, 11111111111111111118, 111111111111111111119 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

J. Earls, On Smarandache Repunit N Numbers, Smarandache Notions Journal, Journal (2004), Vol. 14.1, pp 251-258.

LINKS

Table of n, a(n) for n=1..19.

FORMULA

a(n) = (10^n-1)/9*10^L + n, where L is the number of decimal digits of n.

MATHEMATICA

Array[(10^# - 1)/9*10^IntegerLength[#] + # &, 16] (* or *)

Array[FromDigits[ConstantArray[1, #]~Join~IntegerDigits[#]] &, 16] (* Michael De Vlieger, Mar 21 2018 *)

CROSSREFS

Cf. A070746.

Sequence in context: A263805 A058949 A119742 * A037535 A065834 A104720

Adjacent sequences:  A075839 A075840 A075841 * A075843 A075844 A075845

KEYWORD

base,easy,nonn,less

AUTHOR

Jason Earls, Oct 15 2002

STATUS

approved

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Last modified December 15 00:30 EST 2019. Contains 329988 sequences. (Running on oeis4.)