|
| |
|
|
A002281
|
|
7(10^n - 1)/9.
|
|
17
| |
|
|
0, 7, 77, 777, 7777, 77777, 777777, 7777777, 77777777, 777777777, 7777777777, 77777777777, 777777777777, 7777777777777, 77777777777777, 777777777777777, 7777777777777777, 77777777777777777
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
COMMENTS
| a(n) = A178634(n)/A002283(n). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 31 2010]
|
|
|
FORMULA
| a(n)=10*a(n-1)+7, a(0)=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Jan 23 2009]
a(n)=a(n-1)+7*10^(n-1) with a(0)=0; Also: a(n)=11*a(n-1)-10*a(n-2) with a(0)=0, a(1)=7. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jul 22 2010]
|
|
|
CROSSREFS
| Cf. A002275, A002276, A002277, A002278, A002279, A002280, A002282, A178630. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 31 2010]
Sequence in context: A191465 A144071 A061546 * A097983 A107866 A034176
Adjacent sequences: A002278 A002279 A002280 * A002282 A002283 A002284
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
|
| |
|
|
