a(n) is the least number of the form p^2 + q^2 - 2 for primes p and q that is an odd prime times 2^n, or -1 if there is no such number.
A359492
a(n) is the least number of the form p^2 + q^2 - 2 for primes p and q that is an odd prime times 2^n, or -1 if there is no such number.
Terms
- a(0) =11a(1) =6a(2) =-1a(3) =56a(4) =48a(5) =96a(6) =192a(7) =384a(8) =2816a(9) =1536a(10) =109568a(11) =10582016a(12) =12288a(13) =7429922816a(14) =64176128a(15) =4318724096a(16) =196608a(17) =60486975488
External references
- oeis: A359492