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1359
This number is a composite.
2
1
+ 1, 2
3
+ 3, 2
5
+ 5, and 2
9
+ 9 are
primes
. [
Russo
]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell
21 + 1, 23 + 3, 25 + 5, and 29 + 9 are primes. [Russo]