Friday, January 01, 2021
2021 = 43×47
This year is the product of two consecutive prime numbers.
This doesn't happen very often.
It last happened in 41×43 = 1763 when George III was on the throne.
It'll next happen in 47×53 = 2491 almost half a millennium from now.
It's not rare that the year is the product of two prime numbers.
This last happened in 2×1009 = 2018 and 3×673 = 2019.
It'll next happen in 2×1013 = 2026 and 3×677 = 2031.
But it is rare to be the product of two two-digit prime numbers.
This last happened in 29×67 = 1943 and 37×53 = 1961.
It'll next happen in 23×89 = 2047 and 29×71 = 2059.
I wasn't around for the last two.
I may not be around for the next two.
Happy 43×47 everyone!
Best make the most of it, just as soon as we're allowed...
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