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A104896
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a(0)=0; a(n) = 7*a(n-1) + 7.
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0
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0, 7, 56, 399, 2800, 19607, 137256, 960799, 6725600, 47079207, 329554456, 2306881199, 16148168400, 113037178807, 791260251656, 5538821761599
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Conjecture: this is also the number of integers from 0 to 10^n - 1 that lack 0, 1 and 2 as a digit.
Number of monic irreducible polynomials of degree 1 in GF(7)[x1,...,xn]. - Max Alekseyev (maxale(AT)gmail.com), Jan 23 2006
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FORMULA
| a(n) = (7^(n+1) - 7) / 6 - Max Alekseyev (maxale(AT)gmail.com), Jan 23 2006
a(n) = 7^n+a(n-1) (with a(0)=0). [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 13 2010]
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MAPLE
| a:=n->sum (7^j, j=1..n): seq(a(n), n=0..15); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 03 2007
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CROSSREFS
| Cf. A052386, A052379, A000918, A029858, A080674.
Sequence in context: A180287 A082140 A054614 * A122996 A092315 A092318
Adjacent sequences: A104893 A104894 A104895 * A104897 A104898 A104899
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KEYWORD
| easy,nonn
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AUTHOR
| Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), Apr 24 2005
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