Numbers n such that sigma(n) = phi(n) + phi(n-1) + phi(n-2) + phi(n-3).

Terms

a(0) =1254a(1) =4180a(2) =10542a(3) =12798a(4) =45594a(5) =54834a(6) =217938a(7) =2305100a(8) =4926846a(9) =35645478a(10) =36227862a(11) =49934598a(12) =53384500a(13) =85355648a(14) =234600618a(15) =511921340a(16) =847743090a(17) =1581255708a(18) =1609288450a(19) =1630012240a(20) =4209017505a(21) =4445096658a(22) =9088300212a(23) =9828008364a(24) =13299474798a(25) =47009516442