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A352712
a(n) is the smallest prime in a sequence of 2n consecutive primes that form a symmetrical constellation of cousin primes.
0
7, 7, 7, 853, 1286220583, 178706126107, 888895528231807, 16197229696176289
OFFSET
1,1
COMMENTS
A cousin prime pair is a pair of primes that differ by 4.
a(8) was found by the T. Brada Experimental Grid BOINC project.
LINKS
N. Makarova and C. Rivera, Puzzle 841. Symmetrical compositions of consecutive pairs of cousin primes, The Prime Puzzles and Problems Connection.
EXAMPLE
a(2) = 7 since the 4 consecutive primes (7, 11, 13, 17) are two pairs of cousin primes which are symmetrical because 7 + 17 = 11 + 13.
CROSSREFS
Cf. A274792.
Sequence in context: A024955 A328824 A360080 * A088467 A153496 A011007
KEYWORD
nonn,more
AUTHOR
Natalia Makarova, Mar 30 2022
STATUS
approved