Composite numbers m such that Product_{i=1..k} (p_i/(p_i-1)) / Sum_{i=1..k} (p_i/(p_i+1)) is an integer, where p_i are the k prime factors of m (with multiplicity).
A230112
Composite numbers m such that Product_{i=1..k} (p_i/(p_i-1)) / Sum_{i=1..k} (p_i/(p_i+1)) is an integer, where p_i are the k prime factors of m (with multiplicity).
Terms
- a(0) =4a(1) =8a(2) =16a(3) =64a(4) =256a(5) =720a(6) =800a(7) =2200a(8) =4096a(9) =25600a(10) =33600a(11) =36288a(12) =41472a(13) =46080a(14) =65536a(15) =92400a(16) =104960a(17) =235200a(18) =282240a(19) =338688a(20) =376320a(21) =403200a(22) =419840a(23) =535680a(24) =556640a(25) =576000a(26) =580800a(27) =640000a(28) =844800a(29) =979776
External references
- oeis: A230112