Deletion of Squarian digits

Comment: The article itself says outright that this is |original research. The fact that the digital roots of squares repeat with this sequence is known: {{OEIS|id=A056992}} but with no name or real references there either. It would be a mistake to copy everything from OEIS to here, and even more to keep an article in this form
Stance: delete
Cited policy: Wikipedia:No original research (WP:OR)