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A078638 rad(n(n+1)(n+2)(n+3)). 1
6, 30, 30, 210, 210, 42, 210, 330, 330, 4290, 6006, 2730, 2730, 3570, 510, 1938, 9690, 3990, 43890, 53130, 10626, 7590, 8970, 390, 2730, 15834, 6090, 188790, 26970, 10230, 34782, 39270, 39270, 132090, 147630, 54834, 274170, 303810, 111930 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

EXAMPLE

a(3)=rad(3*4*5*6)=30.

PROG

(PARI) rad(n)=local(p, i); p=factor(n)[, 1]; prod(i=1, length(p), p[i]) for (k=1, 100, print1(rad(k*(k+1)*(k+2)*(k+3))", "))

(PARI) a(n)=my(v=[]); for(i=0, 3, v=concat(v, factor(n+i)[, 1])); v=vecsort(v, , 8); prod(i=1, #v, v[i]) \\ Charles R Greathouse IV, Jun 20 2013

CROSSREFS

Cf. A007947.

Sequence in context: A123624 A287733 A066197 * A068510 A147798 A197880

Adjacent sequences:  A078635 A078636 A078637 * A078639 A078640 A078641

KEYWORD

nonn

AUTHOR

Jon Perry, Dec 12 2002

STATUS

approved

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Last modified November 22 06:06 EST 2018. Contains 317453 sequences. (Running on oeis4.)