A111255 - OEIS

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A111255

Primes in A111254.

11, 17, 29, 41, 67, 73, 89, 97, 107, 127, 151, 157, 181, 191, 271, 307, 337, 347, 389, 409, 439, 461, 491, 499, 547, 701, 709, 733, 757, 769, 821, 877, 911, 929, 971, 1009, 1033, 1063, 1171, 1187, 1249, 1289, 1297, 1307, 1453, 1571, 1597, 1609, 1667, 1697

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

OFFSET

1,1

LINKS

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

FORMULA

a(n) = If Prime[n+2]+Prime[n] is prime then Prime[n+2]+Prime[n]

MAPLE

P:= [seq(ithprime(i), i=1..10000)]:

select(isprime, map(`+`, P[1..-3]+P[3..-1], 1)); # Robert Israel, Jan 03 2021

MATHEMATICA

a = Flatten[Table[If[PrimeQ[Prime[n + 2] +Prime[n] + 1], Prime[n + 2] + Prime[n] + 1, {}], {n, 1, 200}]]