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A153378 Smaller of two consecutive prime numbers such that p1*p2*d - d = average of twin prime pairs, d (delta) = p2 - p1. 13
1187, 8893, 13967, 31817, 33107, 56009, 57587, 66587, 85837, 87797, 90547, 91199, 93497, 101293, 103177, 111667, 113117, 127447, 141397, 142873, 150343, 150407, 151667, 152617, 156817, 157127, 161977, 176819, 179737, 186007, 205957, 209401 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A153379 for the corresponding larger prime.

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

EXAMPLE

1187*1193*6 - 6 = 8496540 and 8496540 +- 1 are primes, so 1187 is a term.

MATHEMATICA

lst={}; Do[p1=Prime[n]; p2=Prime[n+1]; d=p2-p1; a=p1*p2*d-d; If[PrimeQ[a-1]&&PrimeQ[a+1], AppendTo[lst, p1]], {n, 8!}]; lst

CROSSREFS

Cf. A099349, A153374, A153375, A153376, A153377, A153379.

Sequence in context: A237698 A052236 A342066 * A205230 A229539 A233687

Adjacent sequences:  A153375 A153376 A153377 * A153379 A153380 A153381

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Dec 24 2008

STATUS

approved

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Last modified April 18 05:11 EDT 2021. Contains 343072 sequences. (Running on oeis4.)