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A078579
Squarefree kernel of the average of n-th twin prime pair.
3
2, 6, 6, 6, 30, 42, 30, 6, 102, 6, 138, 30, 30, 6, 66, 114, 30, 30, 282, 78, 174, 210, 6, 462, 174, 570, 30, 618, 642, 330, 30, 822, 138, 858, 42, 510, 258, 210, 354, 546, 6, 1230, 426, 1290, 1302, 330, 714, 66, 1482, 186, 402, 30, 834, 1698, 1722, 894, 78
OFFSET
1,1
LINKS
FORMULA
a(n) = A007947(A014574(n)).
a(A070195(n)) = A070195(n).
MATHEMATICA
midQ[n_] := PrimeQ[n-1] && PrimeQ[n+1]; f[n_] := Times @@ FactorInteger[n][[;; , 1]]; f /@ Select[Range[2000], midQ] (* Amiram Eldar, Nov 03 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Nov 29 2002
STATUS
approved