login
A178045
Numbers of semiprimes between consecutive even numbers that are not semiprimes.
0
0, 2, 2, 2, 0, 0, 2, 2, 0, 0, 3, 2, 0, 0, 1, 1, 1, 0, 1, 2, 1, 1, 0, 1, 0, 1, 1, 0, 1, 3, 0, 1, 3, 0, 0, 0, 0, 1, 0, 1, 0, 1, 2, 3, 0, 0, 1, 0, 2, 0, 0, 3, 2, 0, 0, 0, 1, 2, 1, 0, 1, 1, 0, 0, 0, 2, 0, 1, 1, 1, 0, 0, 1, 0, 0, 3, 2, 1, 0, 3, 3, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 2, 0, 1, 1, 1, 1, 0, 0, 1
OFFSET
1,2
COMMENTS
Numbers of semiprimes between A176100(n) and A176100(n+1) where A176100 is twice the n-th nonprime numbers.
EXAMPLE
a(1)=0 because 2*A141468(1)=0<2=2*A141468(2); a(2)=2 because 2*A141468(2)=2<4(semiprime)<6(semiprime)<8=2*A141468(3).
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(66) and a(67) corrected by R. J. Mathar, May 28 2010
STATUS
approved