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.

A321524 Right-rotate nonzero digits in ternary expansion of n and convert back to decimal.

Original entry on oeis.org

0, 1, 2, 3, 4, 7, 6, 5, 8, 9, 10, 19, 12, 13, 22, 21, 14, 23, 18, 11, 20, 15, 16, 25, 24, 17, 26, 27, 28, 55, 30, 31, 58, 57, 32, 59, 36, 37, 64, 39, 40, 67, 66, 41, 68, 63, 38, 65, 42, 43, 70, 69, 44, 71, 54, 29, 56, 33, 34, 61, 60, 35, 62, 45, 46, 73, 48, 49
Offset: 0

Views

Author

Rémy Sigrist, Nov 12 2018

Keywords

Comments

This sequence is a permutation of the nonnegative integers with inverse A321525.

Examples

			The first terms, alongside the corresponding ternary representations, are:
  n   a(n)  ter(n)  ter(a(n))
  --  ----  ------  ---------
   0     0       0          0
   1     1       1          1
   2     2       2          2
   3     3      10         10
   4     4      11         11
   5     7      12         21
   6     6      20         20
   7     5      21         12
   8     8      22         22
   9     9     100        100
  10    10     101        101
  11    19     102        201
  12    12     110        110
  13    13     111        111
  14    22     112        211
  15    21     120        210
  16    14     121        112
  17    23     122        212
		

Crossrefs

Cf. A321464, A321525 (inverse).

Programs

  • PARI
    a(n, base=3) = my (d=digits(n, base), t=select(sign, d), i=-2); for (j=1, #d, if (d[j], d[j]=t[1+(i++%#t)])); fromdigits(d, base)

Formula

a(3 * n) = 3 * a(n).