a(n)=Sum{d(i)*7^i: i=0,1,...,m}, where Sum{d(i)*5^i: i=0,1,...,m} is the base 5 representation of n.
A037466
a(n)=Sum{d(i)*7^i: i=0,1,...,m}, where Sum{d(i)*5^i: i=0,1,...,m} is the base 5 representation of n.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =7a(6) =8a(7) =9a(8) =10a(9) =11a(10) =14a(11) =15a(12) =16a(13) =17a(14) =18a(15) =21a(16) =22a(17) =23a(18) =24a(19) =25a(20) =28a(21) =29a(22) =30a(23) =31a(24) =32a(25) =49a(26) =50a(27) =51a(28) =52a(29) =53
External references
- oeis: A037466