Determine all possible 7-digit decimal (base 10) perfect square(s), each of whose digits is nonzero and even.
Note: While a solution is trivial with the aid of a computer program, show how to derive it without one.
(In reply to re: SLOANE A103705 (spoiler)
Isn't it A030098? ... or A103751?
Yes, indeed - I quoted from memory ...
Just now I CORRECTED MY PREVIOUS POST- but could not edit the title(subject)