Many excellent designs for a new banner were submitted. We will use the best of them in rotation.
1,2
a(9) > 3*10^5. [From Donovan Johnson, Nov 15 2009]
Table of n, a(n) for n=1..8.
prime(3)+1 = 6, prime(3^2)+1 = 30, so 3 is a term of the sequence.
Select[Range[10^5], Mod[Prime[ #^2] + 1, Prime[ # ] + 1] == 0 &]
Sequence in context: A073997 A007118 A012572 * A139802 A063666 A006247
Adjacent sequences: A067845 A067846 A067847 * A067849 A067850 A067851
nonn
Joseph L. Pe, Feb 14 2002
a(7)-a(8) from Donovan Johnson, Nov 15 2009
approved