The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A163125 Sum of digits of the n-th Colombian number, A003052(n). 1
 1, 3, 5, 7, 9, 2, 4, 6, 8, 10, 12, 14, 16, 9, 2, 4, 6, 8, 10, 12, 14, 16, 18, 11, 4, 6, 8, 10, 12, 14, 16, 18, 20, 4, 6, 8, 10, 12, 14, 16, 18, 20, 4, 6, 8, 10, 12, 14, 16, 18, 20, 13, 6, 8, 10, 12, 14, 16, 18, 20, 13, 15, 8, 10, 12, 14, 16, 18, 20, 13, 15, 17, 10, 12, 14, 16, 18, 20, 13 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A007953(A003052(n)). EXAMPLE a(6) = 2 + 0 = 2; a(7) = 3 + 1 = 4. MAPLE A007953 := proc(n) add( d, d= convert(n, base, 10) ); end: isA003052 := proc(n) local k ; for k from 0 to n do if k+A007953(k) = n then RETURN(false): fi; od: RETURN(true) ; end: A003052 := proc(n) option remember; if n = 1 then 1; else for a from procname(n-1)+1 do if isA003052(a) then RETURN(a) ; fi; od; fi; end: A163125 := proc(n) A007953( A003052(n)) ; end: seq(A163125(n), n=1..100) ; # R. J. Mathar, Jul 27 2009 MATHEMATICA sumdig[n_] := Plus @@ IntegerDigits[n]; m = 500; sumdig /@ Complement[Range[m], Table[n + sumdig[n], {n, 1, m}]] (* Amiram Eldar, Nov 28 2020 *) CROSSREFS Cf. A003052, A007953. Sequence in context: A032764 A131669 A004155 * A167047 A065271 A213542 Adjacent sequences:  A163122 A163123 A163124 * A163126 A163127 A163128 KEYWORD nonn,base AUTHOR Juri-Stepan Gerasimov, Jul 21 2009 EXTENSIONS Values after a(51) corrected by R. J. Mathar, Jul 27 2009 STATUS approved

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

Last modified May 22 13:12 EDT 2022. Contains 353950 sequences. (Running on oeis4.)