79

This number is a prime.

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Kari Phillips ©2003

The following poetic quotation contains 79 letters: "When One made love to Zero, spheres embraced their arches and prime numbers caught their breath." Raymond Queneau (French author of the mid-20th century). [Post]

There are 79 connected graphs with 7 edges. [Post]

The largest 2-digit integer N such that N, 4*N and 5*N are all reversals of primes. [Post]

Egon Schulte showed that there are 79 skeletal polyhedra and polygonal complexes in ordinary Euclidean 3-space, which are finite or infinite 3-periodic structures, including 6 infinite families of "chiral" apeirohedra. [Post]