1,1

Table of n, a(n) for n=1..58.

p:=ithprime;

t1:=[];

for i from 1 to 100 do

p1:=p(i);

for j from i to 100 do

p2:=p(j);

if isprime(p2+2) then t1:=[op(t1), p1*p2]; fi;

od: od:

t2:=sort(t1);

Cf. A108605.

Sequence in context: A153519 A020219 A175634 * A130593 A328234 A051221

Adjacent sequences: A134619 A134620 A134621 * A134623 A134624 A134625

nonn

N. J. A. Sloane, Oct 17 2009

approved