A113562 Least multiple of n in which the n-th digit from left is 7.

7, 170, 117, 10072, 100070, 1000074, 1000027, 100000072, 100000017, 10000000070, 10000000087, 1000000000176, 1000000000077, 100000000000278, 1000000000000170, 10000000000000176, 10000000000000067, 1000000000000000170

Offset: 1

Author

Amarnath Murthy, Nov 06 2005

Keywords

• base
• easy
• nonn

Examples

			a(4)= 10072, in which the fourth digit is 7.
		

Crossrefs

Cf. A113556, A113557, A113558, A113559, A113560, A113561.

Programs

Mathematica

lmn7[n_]:=Module[{k=Ceiling[10^(n-1)/n]},While[NumberDigit[k n,IntegerLength[ k n]-n]!=7,k++];k n]; Array[lmn7,10] (* The program generates the first 10 terms of the sequence. *)  (* Harvey P. Dale, Nov 02 2022 *)

Extensions

More terms from Joshua Zucker, May 03 2006