|
|
A045717
|
|
For each prime p take the sum of nonprimes < p.
|
|
0
|
|
|
1, 1, 5, 11, 38, 50, 95, 113, 176, 306, 336, 506, 623, 665, 800, 1050, 1330, 1390, 1710, 1917, 1989, 2369, 2612, 3042, 3693, 3990, 4092, 4407, 4515, 4848, 6408, 6795, 7465, 7603, 8899, 9049, 9819, 10619, 11114, 11964, 12844, 13024, 14698, 14890, 15475
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,3
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
For p=7 we get 1+4+6=11.
|
|
MATHEMATICA
|
nn=200; With[{np=Complement[Range[nn], Prime[Range[PrimePi[nn]]]]}, Table[ Total[Select[np, #<p&]], {p, Prime[Range[PrimePi[nn]]]}]] (* Harvey P. Dale, Jun 25 2013 *)
|
|
PROG
|
(PARI) a(n) = {my(p = prime(n)); sum (i=1, p-1, i*(! isprime(i))); } \\ Michel Marcus, Sep 28 2013
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|