E461 -- Extrait d'une lettre de M. Euler le Pere à M. Bernoulli, concernant le Mémoire imprimé parmi ceux de 1771

(Extract of a letter from the elder Mr. Euler to Mr. Bernoulli, concerning the Memoire published among those of 1771)


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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