Smallest pentagonal number with n prime factors (counted with multiplicity).

Terms

a(0) =1a(1) =5a(2) =22a(3) =12a(4) =210a(5) =176a(6) =1520a(7) =1080a(8) =8400a(9) =55200a(10) =273280a(11) =43776a(12) =2624832a(13) =7173360a(14) =71660160a(15) =100659200a(16) =34255872a(17) =178962432a(18) =3623854080a(19) =17895751680a(20) =5413478400a(21) =43690752000a(22) =927712542720a(23) =733008101376