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A077063 Squarefree kernel of prime(n) - 1. 3
1, 2, 2, 6, 10, 6, 2, 6, 22, 14, 30, 6, 10, 42, 46, 26, 58, 30, 66, 70, 6, 78, 82, 22, 6, 10, 102, 106, 6, 14, 42, 130, 34, 138, 74, 30, 78, 6, 166, 86, 178, 30, 190, 6, 14, 66, 210, 222, 226, 114, 58, 238, 30, 10, 2, 262, 134, 30, 138, 70, 282, 146, 102, 310, 78, 158 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(A077064(n)) = A077064(n).

LINKS

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

FORMULA

a(n) = A007947(A006093(n)).

EXAMPLE

a(25) = rad(prime(25)-1) = rad(97-1) = rad(3*2^5) = 6.

PROG

(PARI) a(n)=my(f=factor(prime(n)-1)[, 1]); prod(i=1, #f, f[i]) \\ Charles R Greathouse IV, Aug 21 2013

(Haskell)

a077063 = a007947 . a006093  -- Reinhard Zumkeller, Sep 04 2013

CROSSREFS

Cf. A077066.

Sequence in context: A051765 A207975 A321623 * A081728 A197218 A080460

Adjacent sequences:  A077060 A077061 A077062 * A077064 A077065 A077066

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Oct 23 2002

STATUS

approved

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Last modified January 23 07:07 EST 2020. Contains 331168 sequences. (Running on oeis4.)