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