Teaser 2515

[Greg Walker]

Take the square of 224 - 50176
Take the cube of 29 - 24389

Interleave them - 5204137869

Extract prime digits, 2, 3, 5 & 7 - gives us 2107, which is prime.

[Cactus]

Hi Greg,

In case you don't know, most discussion of teasers is now going on on
the web site at:

https://sites.google.com/site/sundaytimesteasers/

Brian

[Greg Walker]

Thanks Brian, I didn't know that. So thanks for letting me know. I
just called back to the site because of my typo - should have been
2017.

Greg