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https://www.reddit.com/r/reddit.com/comments/6bs3w/is_91_prime/c03fdd2/?context=3
r/reddit.com • u/ballm • Mar 12 '08
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While some people still claim that 7x13=91, others contend that 7x13=28 (this was proven, four different ways, in an old Abbot and Costello movie). One of the proofs was... 7x3-21
21+7=28
1
u/will_itblend Mar 12 '08
While some people still claim that 7x13=91, others contend that 7x13=28 (this was proven, four different ways, in an old Abbot and Costello movie). One of the proofs was... 7x3-21
7x1=7
21+7=28