Number of triples (a, b, c) with gcd(a, b, c) = 1 and -n <= a,b,c <= n.

Terms

a(0) =0a(1) =26a(2) =98a(3) =290a(4) =578a(5) =1154a(6) =1730a(7) =2882a(8) =4034a(9) =5762a(10) =7490a(11) =10370a(12) =12674a(13) =16706a(14) =20162a(15) =24770a(16) =29378a(17) =36290a(18) =41474a(19) =50114a(20) =57026a(21) =66242a(22) =74882a(23) =87554a(24) =96770a(25) =111170a(26) =123266a(27) =138818a(28) =152642a(29) =172802