a(n) is the least positive number k such that the product of the first n primes that are congruent to 1 (mod 4) is equal to y^2 - k^2 for some integer y.
A350813
a(n) is the least positive number k such that the product of the first n primes that are congruent to 1 (mod 4) is equal to y^2 - k^2 for some integer y.
Terms
- a(0) =2a(1) =4a(2) =24a(3) =38a(4) =16a(5) =588a(6) =5782a(7) =5528a(8) =80872a(9) =319296a(10) =3217476a(11) =32301914a(12) =20085008a(13) =166518276a(14) =2049477188a(15) =17443412442a(16) =27905362944a(17) =233647747282a(18) =886295348972
External references
- oeis: A350813