This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A032740 Numbers k such that k is a substring of 2^k. 10
 6, 10, 35, 36, 37, 44, 49, 51, 60, 67, 72, 73, 82, 85, 89, 93, 179, 188, 190, 191, 226, 234, 252, 297, 312, 321, 356, 373, 391, 425, 429, 430, 438, 445, 451, 475, 478, 479, 486, 516, 519, 521, 526, 549, 551, 581, 582, 583, 598, 601, 603, 609, 613, 619, 627, 632, 642, 652, 653, 655, 660 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS David W. Wilson, Table of n, a(n) for n = 1..10000 EXAMPLE 2^93 = 99035203142830421991929_93_792. MAPLE op(select(n->searchtext(convert(n, string), convert(2^n, string))>0, [\$1..660])); # Paolo P. Lava, Sep 05 2018 MATHEMATICA d[n_] := IntegerDigits[n]; parQ[n_] := MemberQ[Partition[d[2^n], Length[x = d[n]], 1], x]; Select[Range[660], parQ] (* Jayanta Basu, Jun 17 2013 *) Select[Range[700], SequenceCount[IntegerDigits[2^#], IntegerDigits[#]]>0&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jul 10 2019 *) PROG (Haskell) import Data.List (isInfixOf) a032740 n = a032740_list !! (n-1) a032740_list = [x | x <- [0..], show x `isInfixOf` (show \$ 2 ^ x)] -- Reinhard Zumkeller, Jan 19 2014 CROSSREFS Cf. A049301-A049307. Sequence in context: A192774 A218860 A242866 * A167330 A025629 A068889 Adjacent sequences:  A032737 A032738 A032739 * A032741 A032742 A032743 KEYWORD base,nonn,nice,easy AUTHOR Patrick De Geest, May 15 1998 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 October 13 18:14 EDT 2019. Contains 327981 sequences. (Running on oeis4.)