A338868 Number of triples of prime quadruples < 10^n.

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 9, 28, 138, 613, 2799

Offset: 1

Author

Hans H. Brüggemann, Nov 13 2020

Keywords

• nonn
• more

Comments

Number of triples of prime quadruples with at most n digits. A triple of prime quadruples consists of three prime quadruples with a (minimal) distance of 120.

Examples

			For n=12 the a(12)=2 solutions are [(282005261771, 282005261773, 282005261777, 282005261779), (282005261801, 282005261803, 282005261807, 282005261809) , (282005261891, 282005261893, 282005261897, 282005261899)] and [(783976940441, 783976940443, 783976940447, 783976940449), (783976940471, 783976940473, 783976940477, 783976940479), (783976940531, 783976940533, 783976940537, 783976940539)].
		

Links

• J. Brüggemann, The first triples of prime quadruples. [broken link]
• J. Brüggemann, Calculating prime quadruples, its twins, triples and quadruples. [broken link]

Crossrefs

Cf. A050258, A338866.

Extensions

a(18) corrected by Hans H. Brüggemann, May 16 2021