Composite numbers m 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 m (with multiplicity).
A230111
Composite numbers m 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 m (with multiplicity).
Terms
- a(0) =8a(1) =10a(2) =64a(3) =512a(4) =720a(5) =800a(6) =1320a(7) =1944a(8) =4096a(9) =5184a(10) =5760a(11) =6400a(12) =7200a(13) =8370a(14) =23520a(15) =32768a(16) =41472a(17) =44000a(18) =46080a(19) =47040a(20) =51200a(21) =69580a(22) =74088a(23) =76096a(24) =84672a(25) =93000a(26) =95040a(27) =105600a(28) =129360a(29) =235200
External references
- oeis: A230111