Numbers n such that phi(n) is the sum of the first k divisors of n for some k.

Terms

a(0) =1a(1) =2a(2) =18a(3) =42a(4) =48a(5) =72a(6) =152a(7) =210a(8) =378a(9) =462a(10) =765a(11) =1242a(12) =1440a(13) =2080a(14) =2528a(15) =2604a(16) =4480a(17) =6336a(18) =8720a(19) =17248a(20) =17664a(21) =21800a(22) =45675a(23) =84456a(24) =106272a(25) =122220a(26) =318400a(27) =344400a(28) =532016a(29) =654848