2,1

a(5) = 13001 because the smallest 5-digit prime quadruplet is {13001, 13003, 13007, 13009}

Cf. A120120.

Sequence in context: A097649 A072075 A088292 this_sequence A052075 A070854 A075767

Adjacent sequences: A135560 A135561 A135562 this_sequence A135564 A135565 A135566

base,more,nonn

Julien Peter Benney (jpbenney(AT)gmail.com), Feb 23 2008