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A140111 Primes of the form prime(x) + prime(x+1) - (prime(x+1) - prime(x))/2. 0
7, 11, 23, 59, 83, 97, 109, 149, 233, 283, 317, 337, 349, 359, 367, 383, 479, 487, 563, 571, 593, 641, 709, 769, 823, 839, 863 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

3+5-(5-3)/2=3+5-1=7, 5+7-(7-5)/2=5+7-1=11, ...

MATHEMATICA

a = {}; Do[p1 = Prime[n]; p2 = Prime[n + 1]; p = p1 + p2 - (p2 - p1)/2; If[PrimeQ[p], AppendTo[a, p]], {n, 10^2}]; a

CROSSREFS

Cf. A092217.

Sequence in context: A163848 A111671 A213895 * A118072 A141305 A243916

Adjacent sequences:  A140108 A140109 A140110 * A140112 A140113 A140114

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Jun 21 2008

STATUS

approved

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Last modified February 28 23:19 EST 2020. Contains 332353 sequences. (Running on oeis4.)