Primes of the form 1 - sigma(n) + sigma(n)^2 - sigma(n)^3 + sigma(n)^4.

Terms

a(0) =61a(1) =19141a(2) =19141a(3) =152381a(4) =5200081a(5) =5200081a(6) =2031671a(7) =5200081a(8) =40454321a(9) =250062751a(10) =40454321a(11) =212601841a(12) =250062751a(13) =1043960221a(14) =1043960221a(15) =310565641a(16) =954091601a(17) =1043960221a(18) =619281791a(19) =17315368621a(20) =1043960221a(21) =4278255361a(22) =13640692231a(23) =3415627931a(24) =13640692231