Numbers of the form m = p1 * p2 * p3 where for each d|m we have (d+m/d)/2 prime and p1 < p2 < p3 each prime.
A128284
Numbers of the form m = p1 * p2 * p3 where for each d|m we have (d+m/d)/2 prime and p1 < p2 < p3 each prime.
Terms
- a(0) =105a(1) =165a(2) =273a(3) =345a(4) =357a(5) =385a(6) =777a(7) =897a(8) =1045a(9) =1173a(10) =1353a(11) =1653a(12) =1677a(13) =1705a(14) =2193a(15) =2233a(16) =2373a(17) =2905a(18) =3157a(19) =3237a(20) =3333a(21) =3417a(22) =3445a(23) =3553a(24) =3565a(25) =3945a(26) =4053a(27) =4585a(28) =4953a(29) =5665
External references
- oeis: A128284