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A175774 7*(10^n-5) 1
35, 665, 6965, 69965, 699965, 6999965, 69999965, 699999965, 6999999965, 69999999965, 699999999965, 6999999999965, 69999999999965, 699999999999965, 6999999999999965, 69999999999999965, 699999999999999965 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..100

FORMULA

a(n) = 10*a(n-1) +315. - Vincenzo Librandi, Jul 12 2012

G.f.: x*(35+280*x)/((1-10*x)*(1-x)). - Vincenzo Librandi, Jul 12 2012

MATHEMATICA

CoefficientList[Series[(35+280*x)/((1-10*x)*(1-x)), {x, 0, 20}], x] (* Vincenzo Librandi, Jul 12 2012 *)

PROG

(MAGMA) [7*(10^n-5): n in [1..20]]; // Vincenzo Librandi, Jul 12 2012

CROSSREFS

Sequence in context: A010987 A178353 A202127 * A112504 A140405 A278361

Adjacent sequences:  A175771 A175772 A175773 * A175775 A175776 A175777

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Nov 15 2010.

STATUS

approved

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Last modified September 22 11:06 EDT 2020. Contains 337289 sequences. (Running on oeis4.)