OFFSET
1,1
COMMENTS
These primes are neither sorted nor uniqued. They are listed in the order found in A259308.
LINKS
Robert Price, Table of n, a(n) for n = 1..1459
MAPLE
with(numtheory): A259310:=n->`if`(isprime(1+sigma(n)^4), 1+sigma(n)^4, NULL): seq(A259310(n), n=1..200); # Wesley Ivan Hurt, Jul 09 2015
MATHEMATICA
Select[Table[1 + DivisorSigma[1, n]^4, {n, 10000}], PrimeQ]
Select[Table[Cyclotomic[8, DivisorSigma[1, n]], {n, 10000}], PrimeQ]
PROG
(Magma) [a: n in [1..150] | IsPrime(a) where a is 1 + SumOfDivisors(n)^4]; // Vincenzo Librandi, Jun 24 2015
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert Price, Jun 24 2015
STATUS
approved