Centered heptagonal numbers which are sphenic numbers.

Terms

a(0) =638a(1) =4922a(2) =6322a(3) =11978a(4) =15478a(5) =16906a(6) =19426a(7) =21022a(8) =23822a(9) =25586a(10) =28666a(11) =35351a(12) =39698a(13) =48322a(14) =53383a(15) =55126a(16) =70078a(17) =80333a(18) =83546a(19) =92422a(20) =98197a(21) =105358a(22) =107801a(23) =132406a(24) =147806a(25) =156563a(26) =162541a(27) =171718a(28) =182743a(29) =209231