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A141295 Largest m<=n such that all k with 1<=k<=m are divisors of n or coprime to n. 2
1, 2, 3, 4, 5, 3, 7, 5, 5, 3, 11, 7, 13, 3, 5, 5, 17, 3, 19, 5, 5, 3, 23, 8, 9, 3, 5, 5, 29, 3, 31, 5, 5, 3, 9, 7, 37, 3, 5, 5, 41, 3, 43, 5, 5, 3, 47, 8, 13, 3, 5, 5, 53, 3, 9, 5, 5, 3, 59, 7, 61, 3, 5, 5, 9, 3, 67, 5, 5, 3, 71, 9, 73, 3, 5, 5, 13, 3, 79, 5, 5, 3, 83, 7, 9, 3, 5, 5, 89, 3, 13, 5, 5, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

n mod a(n) = 0 or GCD(n,a(n)) = 1;

a(n) = n iff n=1 or n=4 or n is prime; a(A046022(n))=A046022(n);

a(p^2) = 2*p - 1 for odd primes p.

LINKS

R. Zumkeller, Table of n, a(n) for n = 1..10000

CROSSREFS

Cf. A027750, A038566, A076274.

Sequence in context: A140271 A223491 A275823 * A134198 A060653 A274690

Adjacent sequences:  A141292 A141293 A141294 * A141296 A141297 A141298

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jun 23 2008

STATUS

approved

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Last modified August 17 17:05 EDT 2018. Contains 313816 sequences. (Running on oeis4.)