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A079084
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Greatest prime factor of (prime(n)+1)*(prime(n+1)+1)/4.
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3
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3, 3, 3, 3, 7, 7, 5, 5, 5, 5, 19, 19, 11, 11, 3, 5, 31, 31, 17, 37, 37, 7, 7, 7, 17, 17, 13, 11, 19, 19, 11, 23, 23, 7, 19, 79, 79, 41, 29, 29, 13, 13, 97, 97, 11, 53, 53, 19, 23, 23, 13, 11, 11, 43, 43, 11, 17, 139, 139, 71, 71, 11, 13, 157, 157, 83, 83, 29, 29, 59, 59, 23, 23, 19
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n)=A006530(A079079(n)).
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LINKS
| R. Zumkeller, Table of n, a(n) for n = 1..1000 [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 18 2009]
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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] (* From Harvey P. Dale, Nov 14 2011 *)
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CROSSREFS
| Sequence in context: A006166 A142716 A195758 * A092323 A092531 A125002
Adjacent sequences: A079081 A079082 A079083 * A079085 A079086 A079087
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KEYWORD
| nonn,nice
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 22 2002
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