Number Theory

Otis

Elite Member
Joined
Apr 22, 2015
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3,760
Oh for Pete's sake. I'd been counting distinct p's and q's, not ordered pairs!

This is the fourth thread I've misread/mangled in a week. I must need time off. :rolleyes:

Anyway, the pattern 1,1,2,2,3,3,...,9,9 adds up to 90, plus the 19 multiples of 5 below 99 makes 109.

[imath]\;[/imath]
 
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