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A126095 Lesser of pairs of single (non-twin) primes. 1
47, 79, 83, 89, 113, 127, 157, 163, 167, 211, 251, 257, 293, 317, 331, 353, 359, 367, 373, 379, 383, 389, 397, 401, 439, 443, 449, 467, 479, 487, 491, 499, 503, 541, 547, 557, 577, 587, 607, 647, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes p such that p-/+2, nextprime(p)-/+2 are not primes. Cf. A007510 Single (or isolated or non-twin) primes.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

EXAMPLE

47 and 53 are two consecutive primes while 47-/+2, 53-/+2 are not primes;

79 and 83 are two consecutive primes while 79-/+2, 83-/+2 are not primes.

MATHEMATICA

sntpQ[{a_, b_}]:=NoneTrue[Flatten[{a+{2, -2}, b+{2, -2}}], PrimeQ]; Transpose[ Select[Partition[Prime[Range[200]], 2, 1], sntpQ]][[1]] (* The program uses the NoneTrue function from Mathematica version 10 *) (* Harvey P. Dale, Jul 22 2016 *)

CROSSREFS

Cf. A007510.

Sequence in context: A039425 A043248 A044028 * A132259 A046002 A132257

Adjacent sequences:  A126092 A126093 A126094 * A126096 A126097 A126098

KEYWORD

nonn

AUTHOR

Zak Seidov, Mar 03 2007

STATUS

approved

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Last modified November 17 12:58 EST 2018. Contains 317276 sequences. (Running on oeis4.)