A113560 Least multiple of n in which the n-th digit from left is 5.

5, 150, 105, 10052, 10005, 1000050, 1000055, 100000056, 100000035, 10000000050, 10000000065, 1000000000056, 1000000000025, 100000000000054, 100000000000005, 10000000000000256, 10000000000000135, 1000000000000000152, 1000000000000000075, 1000000000000000000500

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..995

Example

a(4) = 4 * 2513 = 10052, in which the fourth digit is 5.

Maple

f:= proc(n) local d, m, R, v;
    for d from n do
      R:= {};
      for m from ceil(10^(d-1)/n) do
        v:= m*n;
        if v > 10^d then break fi;
        v:= v mod 10^(d-n+1);
        if member(v, R) then break fi;
        if floor(v/10^(d-n)) = 5 then return m*n fi;
        R:= R union {v};
      od
    od;
end proc:
map(f, [$1..30]); # Robert Israel, Mar 15 2024

Crossrefs

Cf. A113556, A113557, A113558, A113559.

Sequence in context: A362494 A332716 A230666 * A094364 A232788 A324097

Adjacent sequences: A113557 A113558 A113559 * A113561 A113562 A113563

Keyword

base,easy,nonn

Author

Amarnath Murthy, Nov 06 2005

Extensions

More terms from Joshua Zucker, May 03 2006

Status

approved