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A153377 Larger of two consecutive prime numbers such that p1*p2*d + d = average of twin prime pairs, d (delta) = p2 - p1. 15
7, 11, 43, 47, 103, 107, 127, 229, 337, 383, 571, 653, 739, 757, 877, 977, 1097, 1129, 1171, 1223, 1399, 1511, 2069, 2137, 2203, 2333, 2371, 2411, 2711, 2713, 3719, 4793, 4831, 5023, 5059, 5179, 5483, 5503, 6007, 6029, 6829, 6959, 6971, 7109, 7219, 7481 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See A153376 for the corresponding lesser prime.

LINKS

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

EXAMPLE

5*7*2 + 2 = 72 and 72 +- 1 are primes, so 7 is a term.

7*11*4 + 4 = 312 and 312 +- 1 are primes, so 11 is 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, p2]], {n, 7!}]; lst

CROSSREFS

Cf. A099349, A153374, A153375, A153376.

Sequence in context: A227281 A268579 A129865 * A062209 A086828 A117392

Adjacent sequences:  A153374 A153375 A153376 * A153378 A153379 A153380

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Dec 24 2008

STATUS

approved

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Last modified April 16 05:26 EDT 2021. Contains 343030 sequences. (Running on oeis4.)