A345070 - OEIS

A345070

Averages of two consecutive even-indexed primes.

5, 10, 16, 24, 33, 40, 48, 57, 66, 75, 84, 95, 104, 110, 122, 135, 145, 157, 168, 177, 187, 196, 211, 226, 234, 245, 257, 267, 276, 287, 302, 314, 327, 343, 354, 366, 378, 390, 403, 415, 427, 438, 450, 460, 471, 485, 497, 512, 531, 549, 563, 573, 585, 597, 607, 616, 630

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..57.

FORMULA

a(n) = (prime(2*n) + prime(2*n+2))/2.

EXAMPLE

10 is the average of 7 and 13, which are the 4th and 6th prime numbers.

MATHEMATICA

Table[(Prime[2 n] + Prime[2 n + 2])/2, {n, 80}]

CROSSREFS