A079093 - OEIS

A079093

Squarefree kernel of (prime(n)+1)*(prime(n+1)+1)/4.

3, 6, 6, 6, 42, 21, 30, 30, 30, 30, 38, 399, 462, 66, 6, 30, 930, 1054, 102, 222, 370, 210, 210, 105, 357, 1326, 78, 330, 3135, 114, 66, 1518, 4830, 210, 570, 3002, 6478, 1722, 1218, 870, 2730, 546, 582, 3201, 330, 530, 742, 798, 13110, 4485, 390, 330, 462, 1806

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

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

FORMULA

a(n) = A007947(A079079(n)).

MATHEMATICA

Times@@Transpose[FactorInteger[#]][[1]]&/@(Times@@@Partition[ Prime[ Range[ 60]]+1, 2, 1]/4) (* Harvey P. Dale, Jan 06 2013 *)

PROG

(Haskell)

a079093 = a007947 . a079079 -- Reinhard Zumkeller, Oct 09 2012