OFFSET
1,1
COMMENTS
A similar sequence that allows singular symmetric n-tuples is given in A266583.
a(18) <= 824871967574850703732309 (Jaroslaw Wroblewski)
a(20) <= 824871967574850703732303 (Natalia Makarova and Jaroslaw Wroblewski)
a(19) <= 9425346484752129657862217 & a(19) > 7.8e24. - Dmitry Petukhov, Jan 06 2025
LINKS
N. Makarova and Carlos Rivera, Problem 62. Symmetric k-tuples of consecutive primes, The Prime Puzzles & Problems Connection.
Natalia Makarova and Vladimir Chirkov, Theoretical patterns with a minimal diameter for a(2) - a(50)
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Max Alekseyev, Dec 30 2015
EXTENSIONS
a(1)-a(10) from Natalia Makarova
a(11)-a(14), a(16) from Dmitry Petukhov
a(15), a(17) from Jaroslaw Wroblewski
STATUS
approved