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Search: id:A154550
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| A154550 |
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Greater of two consecutive primes, p < q, such that p*q+p-q is prime. |
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+0
4
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| 3, 5, 11, 23, 29, 47, 59, 83, 131, 223, 233, 239, 347, 401, 449, 467, 479, 503, 509, 607, 641, 673, 971, 997, 1013, 1151, 1163, 1217, 1249, 1283, 1301, 1399, 1409, 1427, 1451, 1459, 1481, 1523, 1601, 1627, 1709, 1733, 1787, 1847, 1889, 1997, 2039, 2309, 2441
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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3*5-2=13, 7*11-4=73, 19*23-4=433, ...
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MATHEMATICA
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lst={}; Do[pp=Prime[n-1]; p=Prime[n]; d=p-pp; If[PrimeQ[pp*p-d], AppendTo[lst, p]], {n, 2, 7!}]; lst
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CROSSREFS
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Cf. A138111, A138170
Sequence in context: A018110 A015915 A106901 this_sequence A023202 A049436 A117010
Adjacent sequences: A154547 A154548 A154549 this_sequence A154551 A154552 A154553
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KEYWORD
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nonn
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AUTHOR
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Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 11 2009
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EXTENSIONS
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Edited by Omar E. Pol, Jan 12 2009
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