A364733 Letters of the English alphabet represented by flag semaphores encoding the positions z of the 2 flags by a two-digit decimal number z = 10*x + y, 1 <= x < y <= 8.

12, 13, 14, 15, 16, 17, 18, 23, 24, 57, 25, 26, 27, 28, 34, 35, 36, 37, 38, 45, 46, 58, 67, 68, 47, 78

Offset

1,1

Comments

Flag positions {x, y}:

. . . . . . . . . \ . . . | . . . / . . . . . .

. O . . O . - O . . O . . O . . O . . O - . O .

. | . / . . . . . . . . . . . . . . . . . . . \

1 2 3 4 5 6 7 8

i.e., angle phi(x) = (7 - x)*Pi/4.

Links

Table of n, a(n) for n=1..26.

Wikipedia, Flag semaphore

Example

  . . .   . . .   \ . .   . | .   . . /   . . .   . . .
  . O .   - O .   . O .   . O .   . O .   . O -   . O .
  / | .   . | .   . | .   . | .   . | .   . | .   . | \
  A  12   B  13   C  14   D  15   E  16   F  17   G  18
.
  . . .   \ . .   . | .   . | .   . . /   . . .   . . .
  - O .   . O .   . O -   . O .   . O .   . O -   . O .
  / . .   / . .   . . .   / . .   / . .   / . .   / . \
  H  23   I  24   J  57   K  25   L  26   M  27   N  28
.
  \ . .   . | .   . . /   . . .   . . .   \ | .   \ . /
  - O .   - O .   - O .   - O -   - O .   . O .   . O .
  . . .   . . .   . . .   . . .   . . \   . . .   . . .
  O  34   P  35   Q  36   R  37   S  38   T  45   U  46
.
  . | .   . . /   . . /   \ . .   . . .   . | /   \ . .
  . O .   . O -   . O .   . O -   . O -   . O .   . O .
  . . \   . . .   . . \   . . .   . . \   . . .   . . \
  V  58   W  67   X  68   Y  47   Z  78  (#  56   -  48)

Crossrefs

Sequence in context: A083826 A343888 A331214 * A270041 A272270 A133894

Adjacent sequences: A364730 A364731 A364732 * A364734 A364735 A364736

Keyword

nonn,base,fini,full

Author

Hugo Pfoertner, Sep 05 2023

Status

approved