a(0)=0. a(n) = a(n-1) + (sum of positive integers which are coprime to n, <= n and missing from {a(0),a(1),a(2),..,a(n-1)}).
A122847
a(0)=0. a(n) = a(n-1) + (sum of positive integers which are coprime to n, <= n and missing from {a(0),a(1),a(2),..,a(n-1)}).
Terms
- a(0) =0a(1) =1a(2) =1a(3) =3a(4) =3a(5) =9a(6) =14a(7) =31a(8) =43a(9) =69a(10) =76a(11) =118a(12) =141a(13) =206a(14) =235a(15) =280a(16) =331a(17) =440a(18) =493a(19) =637a(20) =704a(21) =829a(22) =926a(23) =1152a(24) =1247a(25) =1470a(26) =1613a(27) =1841a(28) =1996a(29) =2375
External references
- oeis: A122847