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a Christmas puzzle by bertoldo https://www.calcudoku.org/forum/viewtopic.php?f=5&t=516 
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Author:  pnm [ Mon Dec 30, 2013 1:49 pm ] 
Post subject:  Re: a Christmas puzzle by bertoldo 
clm wrote: It is true that in a not very far past the 1 was considered a prime (and taught so); in this way, for instance, the Goldbach's conjecture (that every even integer greater than two is the sum of two different primes) looks more consistent: 4 = 3 + 1, 6 = 5 + 1, ... Particularly myself I would prefer to have the 1 among the primes Slowly but surely calcudoku.org is becoming a math reference anyway, so if this site says that 1 is a prime, then it is a prime 
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