Number of distinct primes of the form 4k+1 dividing n minus number of distinct primes of the form 4k+3 dividing n.
A005094
Number of distinct primes of the form 4k+1 dividing n minus number of distinct primes of the form 4k+3 dividing n.
Terms
- a(0) =0a(1) =0a(2) =-1a(3) =0a(4) =1a(5) =-1a(6) =-1a(7) =0a(8) =-1a(9) =1a(10) =-1a(11) =-1a(12) =1a(13) =-1a(14) =0a(15) =0a(16) =1a(17) =-1a(18) =-1a(19) =1a(20) =-2a(21) =-1a(22) =-1a(23) =-1a(24) =1a(25) =1a(26) =-1a(27) =-1a(28) =1a(29) =0
External references
- oeis: A005094