A247261 Positive squares not ending in 00 that remain squares when prefixed with 10.

5625, 50625, 62187890625, 453097265625, 684420119384765625, 4030118984619140625, 7501588188366851806640625, 35596572549171295166015625, 81913198262420037174224853515625, 311932283242100929355621337890625, 891378408151941675529539585113525390625

Offset: 1

Author

Chai Wah Wu, Sep 10 2014

Keywords

• nonn
• base

Examples

			5625 and 105625 are both squares.
		

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..263

Crossrefs

Cf. A242268, A247262, A247263, A247264.

Programs

PARI

for(n=1,10^7,if(n^2%100&&issquare(10^(#Str(n^2)+1)+n^2),print1(n^2,", "))) \\ Derek Orr, Sep 13 2014