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A137386 Numbers that when mirrored vertically are still valid characters. Only applies when numbers are scribed in Arabic numerals. 1

%I #4 Jan 03 2020 21:17:27

%S 0,1,3,6,8,9,10,11,13,16,18,19,30,31,33,36,38,39,60,61,63,66,68,69,80,

%T 81,83,86,88,89,90,91,93,96,98,99,100,101,103,106,108,109,110,111,113,

%U 116,118,119,130,131,133,136,138,139,160,161,163,166,168,169

%N Numbers that when mirrored vertically are still valid characters. Only applies when numbers are scribed in Arabic numerals.

%C Equivalently, numbers that are composed only of the digits 0, 1, 3, 6, 8 and 9. - _Andrew Howroyd_, Jan 03 2020

%H Andrew Howroyd, <a href="/A137386/b137386.txt">Table of n, a(n) for n = 1..1000</a>

%o (PARI) a(n)={my(v=[0,1,3,6,8,9]); fromdigits([v[1+d] | d<-digits(n-1,#v)])} \\ _Andrew Howroyd_, Jan 03 2020

%K nonn,base

%O 1,3

%A Adam Risi (ajrisi(AT)gmail.com), Apr 09 2008

%E Terms a(39) and beyond from _Andrew Howroyd_, Jan 03 2020

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Last modified April 18 15:05 EDT 2024. Contains 371780 sequences. (Running on oeis4.)