A125722 Greatest product of two numbers made up together of decimal digits 0 to n once.

0, 20, 630, 13120, 224120, 3420020, 48460020, 651939020, 8439739020

Offset

1,2

Links

Table of n, a(n) for n=1..9.

Example

The greatest product of two numbers using digits 0 through 7,for instance, occurs when the difference between them is least (since X*Y={(X+Y)^2 - (X-Y)^2}/4), i.e., when the product equals 7420*6531=48640020=a(7).

Crossrefs

Sequence in context: A202577 A059420 A129906 * A336412 A226731 A201724

Adjacent sequences: A125719 A125720 A125721 * A125723 A125724 A125725

Keyword

fini,full,nonn,base

Author

Lekraj Beedassy, Feb 01 2007

Extensions

Edited by Charles R Greathouse IV, Aug 05 2010

Status

approved