The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A172496 a(n) = numerator of fraction a/b, where gcd(a, b) = 1, whose decimal representation has the form 0.(1)(2)(3)...(n-1)(n)... with period (1)(2)(3)...(n-1)(n). 2
 1, 4, 41, 1234, 4115, 41152, 1234567, 1371742, 13717421, 12345678910, 411522630337, 41152263033704, 12345678910111213, 411522630337040438, 41152263033704043805, 12345678910111213141516, 137174210112346812683513, 13717421011234681268351302 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Denominators in A172498. LINKS Alois P. Heinz, Table of n, a(n) for n = 1..369 EXAMPLE a(10) = 12345678910; 12345678910/99999999999 = 0.1234567891012345678910... (period 12345678910). MAPLE a:= n-> (m-> numer(m*sum(10^(-i*length(m)), i=1..infinity)) )(parse(cat(seq(i, i=1..n)))): seq(a(n), n=1..19); # Alois P. Heinz, Mar 31 2022 CROSSREFS Sequence in context: A327026 A244751 A022515 * A059730 A006825 A333731 Adjacent sequences: A172493 A172494 A172495 * A172497 A172498 A172499 KEYWORD nonn,base AUTHOR Jaroslav Krizek, Feb 05 2010 EXTENSIONS More terms from Alois P. Heinz, Mar 31 2022 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 June 18 07:40 EDT 2024. Contains 373469 sequences. (Running on oeis4.)