Composite numbers such that sum_{i=1..k} (p_i/(p_i+1))/product_{i=1..k} (p_i/(p_i+1)) is an integer, where p_i are the k prime factors of n (with multiplicity).
A227248
Composite numbers such that sum_{i=1..k} (p_i/(p_i+1))/product_{i=1..k} (p_i/(p_i+1)) is an integer, where p_i are the k prime factors of n (with multiplicity).
Terms
- a(0) =4a(1) =72a(2) =102a(3) =216a(4) =260a(5) =264a(6) =270a(7) =432a(8) =462a(9) =504a(10) =612a(11) =720a(12) =1980a(13) =2592a(14) =3672a(15) =5184a(16) =5550a(17) =8352a(18) =10368a(19) =15552a(20) =20736a(21) =22032a(22) =25488a(23) =29016a(24) =30240a(25) =31104a(26) =36288a(27) =38880a(28) =41976a(29) =46656
External references
- oeis: A227248