Heptagonal numbers with only even digits.

Terms

a(0) =0a(1) =286a(2) =6426a(3) =6682a(4) =22420a(5) =26884a(6) =28462a(7) =60606a(8) =268468a(9) =280060a(10) =446688a(11) =448804a(12) =604422a(13) =664866a(14) =848848a(15) =2226424a(16) =2240602a(17) =2828644a(18) =2844622a(19) =4268662a(20) =6820282a(21) =8424486a(22) =22062646a(23) =24066868a(24) =26482680a(25) =28404046a(26) =28606648a(27) =44662482a(28) =46822468a(29) =48042064