a(n)=Sum{d(i)*7^i: i=0,1,...,m}, where Sum{d(i)*4^i: i=0,1,...,m} is the base 4 representation of n.
A037461
a(n)=Sum{d(i)*7^i: i=0,1,...,m}, where Sum{d(i)*4^i: i=0,1,...,m} is the base 4 representation of n.
Terms
- a(0) =1a(1) =2a(2) =3a(3) =7a(4) =8a(5) =9a(6) =10a(7) =14a(8) =15a(9) =16a(10) =17a(11) =21a(12) =22a(13) =23a(14) =24a(15) =49a(16) =50a(17) =51a(18) =52a(19) =56a(20) =57a(21) =58a(22) =59a(23) =63a(24) =64a(25) =65a(26) =66a(27) =70a(28) =71a(29) =72
External references
- oeis: A037461