OFFSET
1,2
LINKS
Harry J. Smith, Table of n, a(n) for n=1,...,500
FORMULA
EXAMPLE
a(4) = 202 because (2 + 3 + 5 + 7)^2 - (2^2 + 3^2 + 5^2 + 7^2) = 17^2 - (4 + 9 + 25 + 49) = 289 - 87 = 202
MATHEMATICA
With[{prs=Prime[Range[40]]}, Table[Total[Take[prs, n]]^2-Total[Take[ prs, n]^2], {n, 40}]] (* Harvey P. Dale, Dec 04 2011 *)
PROG
(PARI) { a1=a2=0; for (n=1, 500, a1+=prime(n); a2+=prime(n)^2; write("b065595.txt", n, " ", a1^2 - a2) ) } \\ Harry J. Smith, Oct 23 2009
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Terrel Trotter, Jr., Dec 01 2001
EXTENSIONS
a(26)-a(32) from Harry J. Smith, Oct 23 2009
STATUS
approved