A164653 - OEIS

A164653

a(1) = 1, for n>=2: a(n) = sum of two consecutive noncomposite numbers A008578.

1, 3, 5, 8, 12, 18, 24, 30, 36, 42, 52, 60, 68, 78, 84, 90, 100, 112, 120, 128, 138, 144, 152, 162, 172, 186, 198, 204, 210, 216, 222, 240, 258, 268, 276, 288, 300, 308, 320, 330, 340, 352, 360, 372, 384, 390, 396, 410, 434, 450, 456, 462, 472, 480, 492, 508

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

OFFSET

1,2

COMMENTS

Basically these are the sums of two successive primes. - N. J. A. Sloane, Nov 16 2018

Essentially the same as A001043, A011974 and A069102.

LINKS

Paolo Xausa, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A158611(n) + A158611(n+1).

a(n) = A008578(n-1) + A008578(n) for n >= 2.

a(n) = A076273(n-1) + 1 for n >= 2.