E461 -- Extrait d'un lettre de M. Euler le pere a M. Bernoulli concernant le memoire imprime parmi ceux de 1771

(Extract of a letter by Mr. Euler to Mr. Bernoulli father concerning the memoire published by them in 1771, p. 318)


Summary:

This is a very short note about properties of the numbers 10p, along with criteria for them to be divisible by 2p+1. It also contains a remark that 231-1 is prime and that 41 - x + xx produces prime numbers for x up to 40.

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