

A249765


Numbers that divide the concatenation, in descending order, of their antidivisors.


0




OFFSET

1,1


LINKS

Table of n, a(n) for n=1..8.


EXAMPLE

Antidivisors of 7 are and 2, 3, 5 and their concatenation in descending order is 532. Finally, 532 / 7 = 76.


MAPLE

P:=proc(q) local a, k, n; for n from 3 to q do a:=0;
for k from n1 by 1 to 2 do if abs((n mod k)k/2)<1 then a:=a*10^(ilog10(k)+1)+k; fi; od;
if type(a/n, integer) then print(n); fi; od; end: P(10^9);


CROSSREFS

Cf. A066272, A069872, A224930, A240265, A249764.
Sequence in context: A013786 A285178 A072050 * A201037 A300200 A156169
Adjacent sequences: A249762 A249763 A249764 * A249766 A249767 A249768


KEYWORD

nonn,base,hard,more


AUTHOR

Paolo P. Lava, Nov 06 2014


EXTENSIONS

a(5)a(8) from Chai Wah Wu, Nov 21 2014


STATUS

approved



