Least m such that P - m is prime, where P is the n-th perfect number.

Terms

a(0) =1a(1) =5a(2) =5a(3) =5a(4) =5a(5) =17a(6) =9a(7) =65a(8) =93a(9) =129a(10) =627a(11) =111a(12) =407a(13) =795a(14) =377a(15) =1509a(16) =257a(17) =5207a(18) =1233a(19) =8537a(20) =3917a(21) =20253a(22) =4613a(23) =15435a(24) =5619a(25) =43823