Total number of positive integers < 10^n with multiplicative digital root value 5.

Terms

a(0) =1a(1) =7a(2) =40a(3) =172a(4) =607a(5) =2073a(6) =7414a(7) =26070a(8) =84099a(9) =243529a(10) =636130a(11) =1518166a(12) =3354325a(13) =6940831a(14) =13579716a(15) =25318372a(16) =45270813a(17) =78039555a(18) =130259668a(19) =211289368a(20) =334074499a(21) =516217405a(22) =781284010a(23) =1160386410a(24) =1694081935a(25) =2434633461a(26) =3448679742a(27) =4820368690a(28) =6655010857