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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A031045 Triangle T(n,k): write n in base 8, reverse order of digits. 19
0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, 1, 7, 1, 0, 2, 1, 2, 2, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 2, 0, 3, 1, 3, 2, 3, 3, 3, 4, 3, 5, 3, 6, 3, 7, 3, 0, 4, 1, 4, 2, 4, 3, 4, 4, 4, 5, 4, 6, 4, 7, 4, 0, 5, 1, 5, 2, 5, 3, 5, 4, 5, 5, 5, 6, 5, 7, 5, 0, 6, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..90.

MATHEMATICA

Flatten[Table[Reverse[IntegerDigits[n, 8]], {n, 80}]] (* Harvey P. Dale, Aug 08 2011 *)

PROG

(PARI) A031045(n, k=-1)=/*k<0&&error("Flattened sequence not yet implemented."); */n\8^k%8 \\ Assuming that columns are numbered starting with k=0 as in A030308, A030341, ... NB: The operation could be done using bitwise arithmetic, bitand(n>>(3*k), 7), but this is not significantly faster in PARI. - M. F. Hasler, Jul 21 2013

CROSSREFS

Cf. A030308, A030341, A030386, A031235, A030567, A031007, A031087, A031298 for the base-2 to base-10 analogs.

Sequence in context: A265538 A037850 A037886 * A010877 A257848 A195831

Adjacent sequences:  A031042 A031043 A031044 * A031046 A031047 A031048

KEYWORD

nonn,base,tabf,less

AUTHOR

Clark Kimberling

EXTENSIONS

Initial 0 and better name by Philippe Deléham, Oct 20 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 15 16:06 EDT 2018. Contains 316236 sequences. (Running on oeis4.)