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Dr Sardonicus · 2020-11-13, 02:43

I've hit an impasse with problem 1 (squares whose only decimal digits are 1 and 0).

Apparently unsolved. Best I could do was OEIS A016070, Numbers n such that n^2 contains exactly 2 different digits, excluding 10^m, 2*10^m, 3*10^m.

Gives 21 terms, "No other terms below 3.16*10^20" Sequence thought to be finite.

2020-11-13, 02:43	#5
Dr Sardonicus Feb 2017 Nowhere 2×7×11×29 Posts	I've hit an impasse with problem 1 (squares whose only decimal digits are 1 and 0). Apparently unsolved. Best I could do was OEIS A016070, Numbers n such that n^2 contains exactly 2 different digits, excluding 10^m, 210^m, 310^m. Gives 21 terms, "No other terms below 3.16*10^20" Sequence thought to be finite.