The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A067482 Powers of 4 with initial digit 4. 16
 4, 4096, 4194304, 4294967296, 4398046511104, 4503599627370496, 4611686018427387904, 4722366482869645213696, 4835703278458516698824704, 4951760157141521099596496896, 401734511064747568885490523085290650630550748445698208825344 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Appearances to the contrary, this sequence is not recursive with a geometric progression factor of 1024. Examples of a(n+1)/a(n) which are not 1024 are a(10)/a(9) = a(20)/a(19) = a(30)/a(29) = a(57)/a(56) = a(67)/a(66) = 2^106 or a(39)/a(38) = a(48)/a(47)= a(86)/a(85) = 2^116. - R. J. Mathar, Jan 10 2008 Therefore this sequence differs from A013830. - Georg Fischer, Oct 06 2018 LINKS Muniru A Asiru, Table of n, a(n) for n = 1..71 Tanya Khovanova, Non Recursions FORMULA a(n) = 4^A242594(n). MATHEMATICA DeleteCases[Table[If[StringStartsQ[ToString[4^n], "4"], 4^n], {n, 100}], Null] (* Stefano Spezia, Oct 06 2018 *) PROG (GAP) Filtered(List([0..100], n->4^n), i->ListOfDigits(i)[1]=4); # Muniru A Asiru, Oct 06 2018 CROSSREFS Cf. A000302, A067483, A013830, A242594. Sequence in context: A024061 A013830 A320860 * A249804 A079682 A127235 Adjacent sequences:  A067479 A067480 A067481 * A067483 A067484 A067485 KEYWORD base,easy,nonn AUTHOR Amarnath Murthy, Feb 09 2002 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 20 02:19 EDT 2021. Contains 347577 sequences. (Running on oeis4.)