Composite numbers 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 n (with multiplicity).
A227034
Composite numbers 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 n (with multiplicity).
Terms
- a(0) =4a(1) =16a(2) =72a(3) =132a(4) =256a(5) =800a(6) =1232a(7) =2208a(8) =2960a(9) =5184a(10) =5376a(11) =11904a(12) =19200a(13) =23760a(14) =39040a(15) =41472a(16) =65536a(17) =72000a(18) =76032a(19) =76800a(20) =84816a(21) =203280a(22) =259200a(23) =288768a(24) =332928a(25) =345600a(26) =373248a(27) =383040a(28) =416000a(29) =614400
External references
- oeis: A227034