cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A071586 Powers of 8 written backwards.

Original entry on oeis.org

1, 8, 46, 215, 6904, 86723, 441262, 2517902, 61277761, 827712431, 4281473701, 2954399858, 63767491786, 888318557945, 4011156408934, 23888027348153, 656017679474182, 8425863189971522, 48918490589341081, 278558570881511441
Offset: 0

Views

Author

Benoit Cloitre, Jun 01 2002

Keywords

Crossrefs

Programs

  • PARI
    for(i=1,50,n=8^i; s=ceil(log(n)/log(10)); print1(sum(i=0,s,10^(s-i-1)*(floor(n/10^i)-10*floor(n/10^(i+1)))),","))

A071588 Powers of 6 written backwards.

Original entry on oeis.org

1, 6, 63, 612, 6921, 6777, 65664, 639972, 6169761, 69677001, 67166406, 650797263, 6332876712, 61049606031, 69046146387, 675489481074, 6547099011282, 63744495662961, 614866659955101, 694010047953906, 6792600448516563
Offset: 0

Views

Author

Benoit Cloitre, Jun 01 2002

Keywords

Crossrefs

Programs

  • Mathematica
    FromDigits[Reverse[IntegerDigits[#]]]&/@(6^Range[0,30]) (* Harvey P. Dale, Feb 02 2012 *)
  • PARI
    for(i=1,50,n=5^i; s=ceil(log(n)/log(10)); print1(sum(i=0,s,10^(s-i-1)*(floor(n/10^i)-10*floor(n/10^(i+1)))),","))

Formula

a(n) = A004086(A000400(n)).

A134115 Powers of 9 written backwards and sorted.

Original entry on oeis.org

1, 9, 18, 927, 1656, 94095, 144135, 9692874, 12764034, 984024783, 1044876843, 90695018313, 184635924282, 9238285681452, 16945429767822, 946490231198502, 1481588810203581, 96566699618177661, 121999692536490051
Offset: 1

Views

Author

Jonathan Vos Post, Oct 08 2007

Keywords

Comments

Differs from the unsorted version A071587 near positions i=21, 43, 65 etc. where A071587(i+1) < A071587(i). - R. J. Mathar, Jun 08 2008
Showing 1-3 of 3 results.