OFFSET

1,2

EXAMPLE

a(2) = 25 as 2*5 = 10 which contains two digits, and no smaller value has a digit product with two digits.

a(4) = 2789 as 2*7*8*9 = 1008 which contains four digits, and no smaller value has a digit product with four digits.

CROSSREFS

KEYWORD

nonn,base

AUTHOR

Scott R. Shannon, Nov 16 2019

STATUS

approved