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A070189 12345679n. 2
0, 12345679, 24691358, 37037037, 49382716, 61728395, 74074074, 86419753, 98765432, 111111111, 123456790, 135802469, 148148148, 160493827, 172839506, 185185185, 197530864, 209876543, 222222222, 234567901, 246913580, 259259259 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(82)=1012345678 is the first term which has a digit appearing more than once without an obvious pattern, although a(-82)=-1012345678 might be seen as the concatenation of ten consecutive numbers.

LINKS

Table of n, a(n) for n=0..21.

Tanya Khovanova, Recursive Sequences

Index entries for linear recurrences with constant coefficients, signature (2,-1).

FORMULA

a(n)=n*(10^(10-1)-1)/(10-1)^2

MATHEMATICA

Table[12345679*n, {n, 0, 30}] (* or *) LinearRecurrence[{2, -1}, {0, 12345679}, 30] (* Harvey P. Dale, Oct 16 2015 *)

PROG

(PARI) a(n)=12345679*n \\ Charles R Greathouse IV, Jan 09 2012

CROSSREFS

Cf. A027889, A057932, A060073.

Sequence in context: A164338 A178478 A077302 * A178069 A167233 A187399

Adjacent sequences:  A070186 A070187 A070188 * A070190 A070191 A070192

KEYWORD

base,easy,nonn

AUTHOR

Henry Bottomley, Apr 24 2002

STATUS

approved

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Last modified April 28 05:37 EDT 2017. Contains 285557 sequences.