A069486 a(n) = 2*prime(n)*prime(n+1).

12, 30, 70, 154, 286, 442, 646, 874, 1334, 1798, 2294, 3034, 3526, 4042, 4982, 6254, 7198, 8174, 9514, 10366, 11534, 13114, 14774, 17266, 19594, 20806, 22042, 23326, 24634, 28702, 33274, 35894, 38086, 41422, 44998

Offset: 1

Author

Reinhard Zumkeller, Mar 29 2002

Keywords

• nonn

Comments

a(n) = 2*A006094(n);

together with A069482(n) and A069484(n) a Pythagorean triangle is formed with area = A069487(n).

Crossrefs

Cf. A006094, A069482, A069484, A069487.

Programs

Mathematica

2Times@@#&/@Partition[Prime[Range[40]],2,1] (* Harvey P. Dale, Dec 17 2012 *)