OFFSET
1,16
COMMENTS
See the perception of symmetry on scatterplot of this sequence that is also in Links section.
Are there infinitely many 0's in this sequence?
LINKS
Altug Alkan, Table of n, a(n) for n = 1..10000
Altug Alkan, Alternative Scatterplot of A280008
PROG
(PARI) a002375(n) = sum(i=2, primepi(n), isprime(2*n - prime(i)));
a(n) = a002375(n+1) - a002375(n);
CROSSREFS
KEYWORD
sign
AUTHOR
Altug Alkan, Feb 21 2017
STATUS
approved