Migration complete - please let us know if anything isn't working.
This number is a composite.
Just showing those entries submitted by 'Gaydos': (Click here to show all)
28 is a perfect number expressible as the sum of first five nonprime numbers, i.e., 1 + 4 + 6 + 8 + 9 = 28. [Gaydos]
There are 28 prime numbers with distinct digits that are each the sum of the first n primes. The largest is 906437281 which is the sum of the first 13306 primes. [Gaydos]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell