a(n) is the smallest k such that uphi(k*n) = uphi(k*n+1), or 0 if no such k exists.

Terms

a(0) =1a(1) =10a(2) =373a(3) =5a(4) =4a(5) =372a(6) =5a(7) =26a(8) =248a(9) =2a(10) =13a(11) =186a(12) =11a(13) =562a(14) =247a(15) =13a(16) =627a(17) =124a(18) =195a(19) =1a(20) =183a(21) =86a(22) =245a(23) =93a(24) =5184a(25) =8a(26) =185a(27) =281a(28) =1623a(29) =4320