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

1,1

Links

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

Example

5625 and 105625 are both squares.

Prog

(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

Crossrefs

Cf. A242268, A247262, A247263, A247264.

Sequence in context: A198164 A058003 A202098 * A203831 A014799 A031573

Adjacent sequences: A247258 A247259 A247260 * A247262 A247263 A247264

Keyword

nonn,base

Author

Chai Wah Wu, Sep 10 2014

Status

approved