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!)
 A243615 Numbers n whose digital sum equals the number of binary digits in its binary expansion. 5
 1, 2, 13, 23, 33, 42, 51, 60, 70, 106, 115, 124, 134, 143, 152, 161, 170, 206, 215, 224, 233, 242, 251, 261, 270, 306, 315, 324, 333, 342, 351, 360, 405, 414, 423, 432, 441, 450, 504, 514, 523, 532, 541, 550, 604, 613, 622, 631, 640, 703, 712, 721, 730, 802, 811, 820 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Andreas Boe, Table of n, a(n) for n = 1..10000 EXAMPLE 134 -> 1+3+4=8  134=10000110 -> Eight bits. MATHEMATICA Select[Range[10^3], Total@ IntegerDigits@ # == 1 + Floor@ Log2@ # &] (* Michael De Vlieger, Nov 05 2018 *) PROG (PARI) isok(n) = sumdigits(n) == #binary(n); \\ Michel Marcus, Jun 08 2014 CROSSREFS Cf. A000120, A007953. Sequence in context: A118796 A234218 A171794 * A243617 A045389 A243621 Adjacent sequences:  A243612 A243613 A243614 * A243616 A243617 A243618 KEYWORD nonn,base AUTHOR Andreas Boe, Jun 07 2014 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 May 6 19:52 EDT 2021. Contains 343586 sequences. (Running on oeis4.)