21679
This number is a composite.
Just showing those entries submitted by 'Crespi de Valldaura': (Click here to show all)
Almost certainly the largest non-square integer which is not the sum of
a square and a prime. [Crespi de Valldaura]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell