Heptagonal numbers for which the product of the digits is also a heptagonal number.

Terms

a(0) =0a(1) =1a(2) =7a(3) =1782a(4) =9211a(5) =13213a(6) =212722a(7) =252333a(8) =371911a(9) =766459a(10) =3829753a(11) =5743366a(12) =6534297a(13) =6566671a(14) =13336785a(15) =15347493a(16) =15973168a(17) =17831596a(18) =17965381a(19) =19567813a(20) =27335662a(21) =33154947a(22) =37494513a(23) =47539261a(24) =51817693a(25) =78335613a(26) =93657421