OFFSET
1,12
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.
LINKS
J. Brüggemann, The first triples of prime quadruples. [broken link]
J. Brüggemann, Calculating prime quadruples, its twins, triples and quadruples. [broken link]
EXAMPLE
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)].
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Hans H. Brüggemann, Nov 13 2020
EXTENSIONS
a(18) corrected by Hans H. Brüggemann, May 16 2021
STATUS
approved