Number of simple repdigit polyhedral numbers with n digits.

Terms

a(0) =15a(1) =21a(2) =21a(3) =24a(4) =21a(5) =22a(6) =24a(7) =24a(8) =22a(9) =24a(10) =21a(11) =22a(12) =24a(13) =24a(14) =22a(15) =25a(16) =21a(17) =22a(18) =24a(19) =25a(20) =23a(21) =24a(22) =21a(23) =22a(24) =25a(25) =24a(26) =22a(27) =25a(28) =21a(29) =22