Not sum of three squares by tails

/./{/=$/P;s/.$//;D}
H
s/^/--/
:1
s/\(.\)\(.\)/=--\1---\2/g
/.\{999\}/!b1
x
:
s/\n\w*/&0&1&2&3&4&5&6&7&8&9/g
s/0//
/999/!b
G
D

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