A024455 - OEIS

A024455

[ (3rd elementary symmetric function of P(n))/(2nd elementary symmetric function of P(n)) ], where P(n) = {first n+2 primes}.

0, 2, 4, 7, 11, 17, 23, 30, 39, 50, 61, 74, 88, 104, 121, 140, 160, 182, 204, 228, 254, 282, 312, 343, 376, 409, 444, 480, 519, 561, 604, 648, 695, 743, 793, 845, 898, 954, 1011, 1069, 1130, 1192, 1256

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

P:= [seq(ithprime(i), i=1..102)]:

PS:= ListTools:-PartialSums(P):

S2:= P[1]*P[2]:

S3:= 0:

for n from 1 to 100 do

S3:= S3 + P[n+2]*S2;

S2:= S2 + P[n+2]*PS[n+1];

A[n]:= floor(S3/S2);

od:

seq(A[i], i=1..100); # Robert Israel, Mar 29 2017

CROSSREFS

Sequence in context: A266448 A101978 A076273 * A038045 A178063 A095233

Adjacent sequences: A024452 A024453 A024454 * A024456 A024457 A024458

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved