a(1)=1. a(n+1) = sum a(k), where the sum is over all positive integers k, k <= n, where each positive integer <= k and coprime to k is also coprime to n.
A124693
a(1)=1. a(n+1) = sum a(k), where the sum is over all positive integers k, k <= n, where each positive integer <= k and coprime to k is also coprime to n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =6a(5) =14a(6) =16a(7) =44a(8) =64a(9) =82a(10) =88a(11) =322a(12) =338a(13) =982a(14) =1002a(15) =1006a(16) =2456a(17) =6428a(18) =6766a(19) =19622a(20) =19710a(21) =19728a(22) =19874a(23) =98556a(24) =105322a(25) =126042a(26) =126510a(27) =252610a(28) =253612a(29) =1061208
External references
- oeis: A124693