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A215808 Primes of the form 2*prime(k) - prime(k+1). 3
3, 3, 17, 41, 47, 67, 151, 167, 199, 227, 251, 257, 347, 367, 557, 587, 601, 607, 641, 647, 727, 941, 971, 1051, 1091, 1097, 1117, 1181, 1217, 1277, 1361, 1427, 1447, 1447, 1487, 1487, 1499, 1607, 1697, 1741, 1747, 1741, 1777, 1877, 1901, 2087, 2143, 2281 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Corresponding values of k: 3, 4, 9, 15, 16, 21, 37, 40, 47, 51, 55, 56, 71, 74, 103 (A216075).

LINKS

Zak Seidov, Table of n, a(n) for n = 1..1000

EXAMPLE

k=3: 2*5-7=3, k=4: 2*7-11=3, k=9: 2*23-29=17.

MATHEMATICA

pr=Prime[Range[1000]]; s=Select[2*Most[pr]-Rest[pr], PrimeQ]

Select[2#[[1]]-#[[2]]&/@Partition[Prime[Range[500]], 2, 1], PrimeQ] (* Harvey P. Dale, Feb 25 2017 *)

CROSSREFS

Cf. A062234, A085704, A094104, A094105, A216075.

Sequence in context: A224750 A014783 A090524 * A215076 A095106 A130184

Adjacent sequences:  A215805 A215806 A215807 * A215809 A215810 A215811

KEYWORD

nonn

AUTHOR

Zak Seidov, Sep 06 2012

STATUS

approved

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Last modified October 20 09:24 EDT 2021. Contains 348100 sequences. (Running on oeis4.)