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A002280 6*(10^n - 1)/9. 23
0, 6, 66, 666, 6666, 66666, 666666, 6666666, 66666666, 666666666, 6666666666, 66666666666, 666666666666, 6666666666666, 66666666666666, 666666666666666, 6666666666666666, 66666666666666666 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

a(n-1) = number of Fibonacci numbers F(k), k <= 10^n, which end in 0. a(1)=6 because there are 6 Fibonacci numbers up to 10^2 which end in 0. - Shyam Sunder Gupta (guptass(AT)rediffmail.com) and Benoit Cloitre, Aug 15 2002

a(n) = A178633(n)/A002283(n). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 31 2010]

FORMULA

a(n)=10*a(n-1)+6, with a(n)=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Jan 23 2009]

Contribution from Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Feb 03 2009: (Start)

G.f.: 6x/((1-x)(1-10x))

a(n)=11a(n-1)-10a(n-2) with a(0)=0, a(1)=6 (End)

a(n)=a(n-1)+6*10^(n-1) with a(0)=0; [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 22 2010]

CROSSREFS

Different from A072912. Cf. A073548, etc.

Cf. A002275, A002276, A002277, A002278, A002279, A002281, A002282, A075415, A178631. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 31 2010]

Sequence in context: A155630 A119125 A137120 * A073548 A073549 A119087

Adjacent sequences:  A002277 A002278 A002279 * A002281 A002282 A002283

KEYWORD

easy,nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 17 23:08 EST 2012. Contains 206085 sequences.