a(n) is the smallest number m such that sigma(m)=n*pi(m), or 0 if no such m exists.

Terms

a(0) =3a(1) =2a(2) =6a(3) =38a(4) =44a(5) =92a(6) =66a(7) =174a(8) =108a(9) =688a(10) =120a(11) =954a(12) =300a(13) =2744a(14) =3186a(15) =2424a(16) =2070a(17) =2904a(18) =1080a(19) =3432a(20) =17004a(21) =1042810a(22) =8976a(23) =32232a(24) =20916a(25) =19260a(26) =76908a(27) =5284804a(28) =98064a(29) =281600