A079822 Smallest n-digit multiple of the n-th composite number.

4, 12, 104, 1008, 10000, 100008, 1000006, 10000005, 100000000, 1000000008, 10000000000, 100000000002, 1000000000010, 10000000000008, 100000000000000, 1000000000000014, 10000000000000017

Offset

1,1

Links

Table of n, a(n) for n=1..17.

Mathematica

nm[{a_, b_}]:=Module[{c=Mod[10^(a-1), b]}, If[c==0, 10^(a-1), 10^(a-1)+b-c]]; nm/@ With[{nn=25}, Thread[{Range[nn], Rest[Complement[Range[ nn+ PrimePi[nn]+ 1], Prime[Range[PrimePi[nn+1]]]]]}]] (* Harvey P. Dale, Feb 14 2012 *)

Crossrefs

Cf. A079821.

Sequence in context: A120267 A012278 A070040 * A216043 A245647 A080448

Adjacent sequences: A079819 A079820 A079821 * A079823 A079824 A079825

Keyword

base,nonn

Author

Amarnath Murthy, Feb 11 2003

Extensions

More terms from Erich Friedman, Aug 08 2005

Status

approved