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1,1

Table of n, a(n) for n=1..49.

Select[Prime[Range[200]], PrimeQ[20#+3]&&PrimeQ[20#-3]&]

(MAGMA) [p: p in PrimesUpTo(2500) | IsPrime(20*p-3) and IsPrime(20*p+3)]; [From Vincenzo Librandi, Nov 13 2010]

Sequence in context: A049779 A281906 A256491 * A194552 A079780 A178621

Adjacent sequences: A106006 A106007 A106008 * A106010 A106011 A106012

nonn

Zak Seidov, May 05 2005

approved