login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A181303 Numbers of the form i*7^j-1 (i=1..6, j >= 0). 8
0, 1, 2, 3, 4, 5, 6, 13, 20, 27, 34, 41, 48, 97, 146, 195, 244, 293, 342, 685, 1028, 1371, 1714, 2057, 2400, 4801, 7202, 9603, 12004, 14405, 16806, 33613, 50420, 67227, 84034, 100841, 117648, 235297, 352946, 470595, 588244, 705893, 823542, 1647085, 2470628, 3294171, 4117714, 4941257 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..48.

Index entries for linear recurrences with constant coefficients, signature (1,0,0,0,0,7,-7).

FORMULA

G.f.: x^2*(x+1)*(x^2-x+1)*(x^2+x+1) / ((x-1)*(7*x^6-1)). - Colin Barker, Feb 01 2013

MATHEMATICA

Sort[Flatten[Table[i 7^j-1, {i, 1, 6}, {j, 0, 7}]]]  (* Harvey P. Dale, Feb 03 2011 *)

CROSSREFS

Smallest number whose base b sum of digits is n: A000225 (b=2), A062318 (b=3), A180516 (b=4), A181287 (b=5), A181288 (b=6), this sequence (b=7), A165804 (b=8), A140576 (b=9), A051885 (b=10). - Jason Kimberley, Nov 02 2011

Sequence in context: A153695 A300857 A255261 * A276529 A200330 A121433

Adjacent sequences:  A181300 A181301 A181302 * A181304 A181305 A181306

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jan 25 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 12 01:57 EST 2019. Contains 329948 sequences. (Running on oeis4.)