Nonprimes m such that phi(m)*sigma(m) is divisible by m+1.

Terms

a(0) =15a(1) =20a(2) =35a(3) =95a(4) =104a(5) =143a(6) =207a(7) =255a(8) =287a(9) =319a(10) =323a(11) =464a(12) =539a(13) =650a(14) =890a(15) =899a(16) =1023a(17) =1034a(18) =1199a(19) =1295a(20) =1349a(21) =1407a(22) =1519a(23) =1763a(24) =1952a(25) =2015a(26) =2204a(27) =2834a(28) =2975a(29) =3599