64079 (number)

64079 (number)

64079 is the twenty-third Lucas number and is thus often written as L₂₃. It is significant for being the first Lucas number L_n where n is prime that is itself not prime. In a closely related property, 64079 is the smallest extra strong Lucas pseudoprime to base 2.

Its smaller prime factor, 139, can be written in the form 6n+1, where n is the index of the Lucas number. The larger factor, 461, can similarly be written in the form 20n+1.