Nonprimes whose proper divisors are partition numbers.

Terms

a(0) =4a(1) =6a(2) =9a(3) =10a(4) =14a(5) =15a(6) =21a(7) =22a(8) =25a(9) =33a(10) =35a(11) =49a(12) =55a(13) =77a(14) =121a(15) =202a(16) =303a(17) =505a(18) =707a(19) =1111a(20) =10201a(21) =35954a(22) =53931a(23) =89885a(24) =125839a(25) =197747a(26) =1815677a(27) =21239726a(28) =31859589a(29) =53099315