A166448 Sum of first n primes minus next prime.

-1, 0, 3, 6, 15, 24, 39, 54, 71, 98, 123, 156, 195, 234, 275, 322, 379, 434, 497, 566, 633, 708, 785, 866, 959, 1058, 1157, 1262, 1367, 1466, 1589, 1714, 1849, 1978, 2125, 2270, 2421, 2580, 2741, 2908, 3085, 3256, 3445, 3634, 3829, 4016, 4215, 4434, 4659, 4884

Offset: 1

Author

Vladimir Joseph Stephan Orlovsky, Oct 13 2009

Keywords

• sign

Examples

			2-3=-1, 2+3-5=0, 2+3+5-7=3,..
		

Links

• Bill McEachen, Table of n, a(n) for n = 1..20000

Crossrefs

Cf. A007504

Programs

Mathematica

Clear[lst,n,a,b]; a=0;lst={};Do[a+=Prime[n];b=a-Prime[n+1];AppendTo[lst,b],{n,5!}];lst
Module[{nn=60,prs},prs=Prime[Range[nn]];Accumulate[Take[prs,nn-1]]- Take[ prs,{2,nn}]] (* Harvey P. Dale, Oct 12 2015 *)

PARI

A166448()={ summ=0; for (n=1, 500, p=prime(n); summ+=p;
write("b166448.txt", n, " ", (summ-prime(n+1)) ));  \\end FOR }