1,1

a(3)=17=4*4+1, a(4)=19=4*4+3

i:=1:for k from 1 to 600 do if isprime(4*k+1) and isprime(4*k+3) then a[i]:=4*k+1:a[i+1]:=4*k+3: i:=i+2 fi od: seq(a[n], n=1..i-1);

Cf. A001097.

Sequence in context: A163633 A092242 A003630 this_sequence A079016 A106120 A106121

Adjacent sequences: A122562 A122563 A122564 this_sequence A122566 A122567 A122568

nonn

Miklos Kristof (kristmikl(AT)freemail.hu), Sep 21 2006