OFFSET
1,1
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..1000
MATHEMATICA
a[n_]:=FactorInteger[(Prime[n]+1)(Prime[n+1]+1)/4][[-1, 1]]; Table[a[n], {n, 1, 74}] (* Jean-François Alcover, Mar 18 2011 *)
FactorInteger[(First[#]+1) (Last[#]+1)/4][[-1, 1]]&/@Partition[Prime[ Range[100]], 2, 1] (* Harvey P. Dale, Nov 14 2011 *)
PROG
(Haskell)
a079084 = a006530 . a079079 -- Reinhard Zumkeller, Oct 08 2012
(PARI) a(n) = my(f=factor((prime(n)+1)*(prime(n+1)+1)/4)); f[#f~, 1]; \\ Michel Marcus, Nov 12 2023
CROSSREFS
KEYWORD
nonn,nice
AUTHOR
Reinhard Zumkeller, Dec 22 2002
STATUS
approved