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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A324646 a(n) = gcd(n, A276086(n-1)). 4
 1, 2, 3, 2, 1, 6, 1, 2, 3, 10, 1, 6, 1, 2, 15, 2, 1, 18, 1, 10, 3, 2, 1, 6, 25, 2, 3, 2, 1, 30, 1, 2, 3, 2, 7, 18, 1, 2, 3, 10, 1, 42, 1, 2, 15, 2, 1, 6, 7, 50, 3, 2, 1, 18, 5, 14, 3, 2, 1, 30, 1, 2, 21, 2, 1, 6, 1, 2, 3, 70, 1, 18, 1, 2, 75, 2, 7, 6, 1, 10, 3, 2, 1, 42, 5, 2, 3, 2, 1, 90, 7, 2, 3, 2, 1, 6, 1, 98, 3, 10, 1, 6, 1, 2, 105 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Antti Karttunen, Table of n, a(n) for n = 1..30030 FORMULA a(n) = gcd(n, A276086(n-1)). a(A002110(n)) = A002110(n) for all n >= 0. PROG (PARI) A276086(n) = { my(i=0, m=1, pr=1, nextpr); while((n>0), i=i+1; nextpr = prime(i)*pr; if((n%nextpr), m*=(prime(i)^((n%nextpr)/pr)); n-=(n%nextpr)); pr=nextpr); m; }; A324646(n) = gcd(n, A276086(n-1)); CROSSREFS Cf. A002110, A276086, A324198, A324644. Sequence in context: A226362 A228549 A079893 * A286156 A113908 A355624 Adjacent sequences: A324643 A324644 A324645 * A324647 A324648 A324649 KEYWORD nonn AUTHOR Antti Karttunen, Mar 11 2019 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 February 7 10:10 EST 2023. Contains 360115 sequences. (Running on oeis4.)