We just completed a major update. Let us know if anything is not working.

# 8575

This number is a composite.

Just showing those entries submitted by 'Gupta': (Click here to show all)

The smallest odd composite number n which satisfy the equation sigma(n+2)=sigma(n)+2 , where sigma(n) is sum of divisors of n. [Gupta]

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