A092949 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A092949

Numbers of the form prime(n+1) + prime(n) + 1.

6, 9, 13, 19, 25, 31, 37, 43, 53, 61, 69, 79, 85, 91, 101, 113, 121, 129, 139, 145, 153, 163, 173, 187, 199, 205, 211, 217, 223, 241, 259, 269, 277, 289, 301, 309, 321, 331, 341, 353, 361, 373, 385, 391, 397, 411, 435, 451, 457, 463, 473, 481, 493, 509, 521

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

Carlos Rivera, Puzzle 1021. p(k)+p(k+1)+1, The Prime Puzzles and Problems Connection. A puzzle about these numbers.

FORMULA

a(n) = A001043(n) + 1. - Michel Marcus, Mar 15 2020

MAPLE

seq( ithprime(x)+ithprime(x+1)+1, x=1..80);

MATHEMATICA

Total/@Partition[Prime[Range[60]], 2, 1]+1 (* Harvey P. Dale, Jun 24 2015 *)