A126755 - OEIS

A126755

Braille numberdromes: numbers which read the same backwards and forwards in Braille.

1, 2, 3, 7, 11, 22, 33, 46, 59, 64, 77, 80, 95, 111, 121, 131, 161, 171, 212, 222, 232, 262, 272, 313, 323, 333, 373, 416, 426, 436, 476, 519, 529, 539, 579, 614, 624, 634, 674, 717, 727, 737, 777, 810, 820, 830, 870, 915, 925, 935, 975

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

The pairs 4 and 6, 5 and 9 and 0 and 8 are mirror images of each other. When a Braille number is read backward (as a mirror-image) the number is usually not the same as the original. Those that are the same could be called by analogy with the ordinary numberdromes the Braille numberdromes. Those with "a double yolk", such as 1081, would be Braille numberddromes, by analogy with palinddromes.

LINKS

Table of n, a(n) for n=1..51.

EXAMPLE

a(8) = 46 because in Braille 4 and 6 are mirror images of each other.

CROSSREFS

Cf. A121018.

Sequence in context: A034431 A339610 A095766 * A228592 A034795 A165318

Adjacent sequences: A126752 A126753 A126754 * A126756 A126757 A126758

KEYWORD

easy,nonn,base

AUTHOR

Michael Joseph Halm, Apr 23 2007

STATUS

approved