

A351649


a(n) = minimal average of a pair of twin primes m, such that m * twin_prime(n) is the average of another pair of twin primes, or 1 if no m exists.


0



4, 6, 6, 18, 150, 6, 12, 12, 42, 30, 30, 18, 462, 18, 570, 42, 6, 6, 102, 6, 12, 12, 420, 192, 18, 600, 5100, 570, 18, 4050, 30, 42, 18, 60, 12, 12, 6, 102, 6, 6, 108, 42, 42, 18, 570, 30, 180, 108, 2970, 12, 60, 270, 12, 60, 42, 60, 1950, 102, 108, 18, 72, 348
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


LINKS



EXAMPLE

11 is the fourth twin prime, i.e., A001097(4). 18 is the minimal average of a twin prime pair, i.e., (17,19), where 18*11=198 is the average of the twin prime pair (197,199). So, a(4)=18.


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS



STATUS

approved



