A050734 Numbers of form 4^k (values of k see A050725) containing no pair of consecutive equal digits (probably finite).

1, 4, 16, 64, 256, 1024, 4096, 16384, 1048576, 4194304, 268435456, 1073741824, 4294967296, 17179869184, 68719476736, 281474976710656, 18014398509481984, 72057594037927936, 73786976294838206464, 295147905179352825856, 1208925819614629174706176, 20282409603651670423947251286016, 85070591730234615865843651857942052864

Offset

1,2

Comments

No additional terms up to 4^25000. - Harvey P. Dale, Oct 06 2011

Links

Table of n, a(n) for n=1..23.

Mathematica

Select[4^Range[0, 60], !MemberQ[Differences[IntegerDigits[#]], 0]&] (* Harvey P. Dale, Oct 06 2011 *)

Crossrefs

Cf. A043096, A050725.

Sequence in context: A270142 A000302 A262710 * A075614 A083592 A069029

Adjacent sequences: A050731 A050732 A050733 * A050735 A050736 A050737

Keyword

nonn,base

Author

Patrick De Geest, Sep 15 1999

Extensions

Terms a(21), a(22), and a(23) added by Harvey P. Dale, Oct 06 2011

Status

approved