English Title
Observations on a theory of Fermat and others on looking at prime numbers
Enestrom Number
26
Fuss Index
23
Original Language
Latin
Content Summary
Euler shows that the fifth Fermat number, 225+1 = 4,294,967,297, is not prime because it is divisible by 641, though he does not give any clues about how he discovered this fact. He also tacks on a few "theorems" but says that he does not yet know how to prove them.
Published as
Journal article
Published Date
1738
Written Date
1732
Original Source Citation
Commentarii academiae scientiarum Petropolitanae, Volume 6, pp. 103-107.
Opera Omnia Citation
Series 1, Volume 2, pp.1-5.
Record Created
2018-09-25
E026en.pdf (71 kB)
