A099466 - 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

A099466

Numbers n such that 3*prime(n) + prime(n+1) - 3 is prime.

2, 3, 4, 5, 6, 7, 11, 12, 13, 14, 15, 19, 20, 22, 25, 30, 31, 33, 34, 36, 37, 38, 44, 45, 47, 49, 53, 55, 58, 59, 60, 63, 66, 67, 73, 79, 83, 87, 91, 93, 95, 98, 105, 107, 113, 115, 118, 122, 123, 127, 131, 135, 141, 144, 145, 147, 150, 153, 160, 162, 165, 167, 172, 177

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

OFFSET

1,1

LINKS

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

EXAMPLE

a(2)=4 since 3*prime(4) + prime(5) - 3 = 3*7 + 11 - 3 = 29 is prime.

MAPLE

P:= select(isprime, [2, seq(i, i=3..10^4, 2)]):

select(n -> isprime(3*P[n]+P[n+1]-3), [$1..nops(P)-1]); # Robert Israel, Nov 29 2017

CROSSREFS

Sequence in context: A214677 A275910 A032971 * A358673 A032976 A174219