# 180

This number is a composite.

180 can be represented by the product of the squares of the first two primes times the sum of the first two primes. [Sladcik]

The product of first four triangular numbers (i.e., 1*3*6*10) is the largest known n of this type such that n+1 and n-1 are twin primes. [Gupta]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell