

A068822


a(n) = gcd(n,c(n)), where c(n) is the 10's complement of n.


4



1, 2, 1, 2, 5, 2, 1, 2, 1, 10, 1, 4, 1, 2, 5, 4, 1, 2, 1, 20, 1, 2, 1, 4, 25, 2, 1, 4, 1, 10, 1, 4, 1, 2, 5, 4, 1, 2, 1, 20, 1, 2, 1, 4, 5, 2, 1, 4, 1, 50, 1, 4, 1, 2, 5, 4, 1, 2, 1, 20, 1, 2, 1, 4, 5, 2, 1, 4, 1, 10, 1, 4, 1, 2, 25, 4, 1, 2, 1, 20, 1, 2
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OFFSET

1,2


LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..9999


FORMULA

a(n) = gcd(n,A089186(n)) = gcd(n,A178914(n)).  Alois P. Heinz, Nov 05 2018


EXAMPLE

a(45) = 5 as 10's complement of 45 is 10045 = 55 and (45,55) = 5.


MAPLE

a:=n> igcd((10^length(n)n), n):
seq(a(n), n=1..100); # Alois P. Heinz, Sep 22 2015


MATHEMATICA

GCD[#, 10^(IntegerLength[#])  #] & /@ Range[82] (* Jayanta Basu, Aug 07 2013 *)


CROSSREFS

Cf. A089186, A178914.
Sequence in context: A135506 A295516 A330209 * A337224 A090079 A165195
Adjacent sequences: A068819 A068820 A068821 * A068823 A068824 A068825


KEYWORD

nonn,base,easy


AUTHOR

Amarnath Murthy, Mar 08 2002


STATUS

approved



