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A083466
Smallest nontrivial multiple of n ending in n. By nontrivial one means a(n) is not equal to n or concatenation of n with itself.
1
21, 12, 63, 24, 15, 36, 147, 48, 189, 110, 2211, 312, 2613, 714, 315, 416, 3417, 918, 3819, 120, 4221, 1122, 4623, 624, 125, 1326, 5427, 728, 5829, 330, 6231, 832, 6633, 1734, 735, 936, 7437, 1938, 7839, 240, 8241, 2142, 8643, 1144, 945
OFFSET
1,1
MAPLE
A083466 := proc(n)
ndgs := convert(n, base, 10) ;
for k from 2 do
if k*n <> digcat2(n, n) then
kdgs := convert(k*n, base, 10) ;
mtch := true ;
for i from 1 to nops(ndgs) do
if op(i, ndgs) <> op(i, kdgs) then
mtch := false;
break;
end if;
end do:
if mtch then
return k*n ;
end if;
end if;
end do:
end proc: # R. J. Mathar, Aug 23 2014
CROSSREFS
Sequence in context: A166033 A228092 A071262 * A307312 A120742 A118296
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 02 2003
EXTENSIONS
More terms from R. J. Mathar, Aug 23 2014
STATUS
approved