A158912 Primitive numbers n whose square can be represented as a four "digit" repdigit number in some base < n.

20, 1218, 7540, 20280, 1373090, 4903600, 23308460, 316540365, 527813814, 4091661910, 16718044954, 1034412600, 142903074740, 1827252574658, 31036383127940

Offset: 1

Author

T. D. Noe, Mar 30 2009

Keywords

• nonn
• base

Examples

			20^2 = 1111 in base 7
1218^2 = (21)(21)(21)(21) in base 41
7540^2 = (58)(58)(58)(58) in base 99
		

Crossrefs

A158235, A158245