a(n)=Sum{d(i)*7^i: i=0,1,...,m}, where Sum{d(i)*3^i: i=0,1,...,m} is the base 3 representation of n.
A037455
a(n)=Sum{d(i)*7^i: i=0,1,...,m}, where Sum{d(i)*3^i: i=0,1,...,m} is the base 3 representation of n.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =7a(4) =8a(5) =9a(6) =14a(7) =15a(8) =16a(9) =49a(10) =50a(11) =51a(12) =56a(13) =57a(14) =58a(15) =63a(16) =64a(17) =65a(18) =98a(19) =99a(20) =100a(21) =105a(22) =106a(23) =107a(24) =112a(25) =113a(26) =114a(27) =343a(28) =344a(29) =345
External references
- oeis: A037455