Numbers k that divide the alternating sum phi(1) - phi(2) + phi(3) - phi(4) + ... + ((-1)^(k+1))*phi(k).

A067929

Numbers k that divide the alternating sum phi(1) - phi(2) + phi(3) - phi(4) + ... + ((-1)^(k+1))*phi(k).

Terms

    a(0) =1a(1) =2a(2) =4a(3) =12a(4) =17a(5) =55a(6) =57a(7) =80a(8) =195a(9) =211a(10) =233a(11) =602a(12) =694a(13) =1319a(14) =2726a(15) =26312a(16) =71173a(17) =101457a(18) =145789a(19) =165710a(20) =299228a(21) =483888a(22) =718738a(23) =1757846a(24) =4206121a(25) =9518456a(26) =15505388a(27) =15885915a(28) =15929230a(29) =26445656

External references