# 55

This number is a composite.

55 is 5 times the 5^{th} prime. [Woods]

Every number greater than 55 is the sum of distinct primes of the
form 4*n* + 3. [Wells]

If sigma(*n*)/*n* is greater than 9, then *n* has
at least 55 distinct prime factors. [Laatsch]

Klimov (1975) showed that all integers are the sum of at most 55 prime numbers.

2^55-55 is the largest non-titanic prime of form 2^n-n, where n is a composite number. [Loungrides]

(There are 4 curios for this number that have not yet been approved by an editor.)

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell