OFFSET
1,1
EXAMPLE
a(1) = 2 - 4 = -2 -> for prime 2
a(2) = 3 - 6 = -3 -> for prime 3
a(3) = 5 - 9 = -4 -> for prime 5
a(4) = 7 - 11 = -4 -> for prime 7
a(5) = 11 - 14 = -3 -> for prime 11
CROSSREFS
KEYWORD
sign
AUTHOR
Alexander R. Povolotsky, Jan 06 2008
STATUS
approved