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A083720 Product of primes less than greatest prime factor of n but not dividing n. 2
1, 1, 2, 1, 6, 1, 30, 1, 2, 3, 210, 1, 2310, 15, 2, 1, 30030, 1, 510510, 3, 10, 105, 9699690, 1, 6, 1155, 2, 15, 223092870, 1, 6469693230, 1, 70, 15015, 6, 1, 200560490130, 255255, 770, 3, 7420738134810, 5, 304250263527210, 105, 2, 4849845 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(n)=A002110(A049084(A006530(n)))/A007947(n); a(A000040(k))=A000961(k))=A002110(k-1);

a(n)=1 iff n=m*A002110(k) and A006530(m)<=A000040(k).

LINKS

Table of n, a(n) for n=1..46.

CROSSREFS

Cf. A079067, A083722.

Sequence in context: A173279 A277440 A321597 * A055878 A331654 A302690

Adjacent sequences:  A083717 A083718 A083719 * A083721 A083722 A083723

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 04 2003

STATUS

approved

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Last modified August 10 12:19 EDT 2020. Contains 336379 sequences. (Running on oeis4.)