A081433 Numbers n such that RevBinary(RevDecimal(n))=RevDecimal(RevBinary(n)), where RevDecimal(n) is the decimal reversal of n (A004086) and RevBinary(n) is the binary reversal of n (A030101).

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 15, 33, 51, 66, 99, 165, 313, 516, 535, 561, 585, 615, 626, 717, 759, 858, 929, 957, 1241, 1421, 2112, 2482, 2552, 2842, 3579, 4224, 5485, 5845, 6336, 7447, 8448, 9009, 9753, 11051, 12631, 13621, 15011, 15351, 15375

Offset

1,3

Comments

A030101(A004086(a(n)))=A004086(A030101(a(n))), A081431(a(n))=A081432(a(n)).

Links

Table of n, a(n) for n=1..49.

Prog

(Python)
def ok(n): return int(bin(int(str(n)[::-1]))[:1:-1], 2) == int(str(int(bin(n)[:1:-1], 2))[::-1])
print([k for k in range(2**14) if ok(k)]) # Michael S. Branicky, Jan 30 2023

Crossrefs

Cf. A081432, A081434, A007088.

Sequence in context: A049101 A287336 A048406 * A032581 A062504 A305458

Adjacent sequences: A081430 A081431 A081432 * A081434 A081435 A081436

Keyword

nonn,base

Author

Reinhard Zumkeller, Mar 20 2003

Status

approved