perplexus.info :: Numbers : Square creates square

Square creates square (Posted on 2021-05-18)

Compile a list of all square integers below 10,000, not terminating by zero, such that erasing their two last digits creates a new square number.

See The Solution Submitted by Ady TZIDON

Rating: 5.0000 (2 votes)

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Official solution

| Comment 7 of 9 |

Only 8 numbers, all below 2000, qualify:

All squares beginning with 1, 4, 9, or 16.

121, 144, 169, 196

441, 484,

961,

1681.

NB: COULD NOT POST IT AS A SOLUTION IN THE RIGHT PLACE,

SOME «@&&?))(()? THERE.

Edited on May 24, 2021, 4:24 am

Posted by Ady TZIDON on 2021-05-24 04:15:47

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