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A071256
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Smallest multiple of n sandwiched between twin primes.
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5
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4, 4, 6, 4, 30, 6, 42, 72, 18, 30, 198, 12, 312, 42, 30, 192, 102, 18, 228, 60, 42, 198, 138, 72, 150, 312, 108, 420, 348, 30, 1302, 192, 198, 102, 420, 72, 1998, 228, 312, 240, 1230, 42, 1032, 660, 180, 138, 282, 192, 882, 150, 102, 312, 6360, 108, 660
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Conjecture: lim sup n ->infinity a(n)/n^2 exists = C, where 0<C<1. - Benoit Cloitre (benoit7848c(AT)orange.fr), May 23 2002
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..1000
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MATHEMATICA
| Table[ s = 2; While[ Mod[s, n] + 2 - Boole[ PrimeQ[s - 1]] - Boole[ PrimeQ[s + 1]] > 0, s++]; s, {n, 1, 55}] (* From Jean-François Alcover, Dec 08 2011, after Pari *)
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PROG
| (PARI) for(n=1, 100, s=2; while(s%n+2-isprime(s-1)-isprime(s+1)>0, s++); print1(s, ", "))
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CROSSREFS
| Cf. A071558
Sequence in context: A066560 A205031 A085050 * A078240 A016710 A121064
Adjacent sequences: A071253 A071254 A071255 * A071257 A071258 A071259
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KEYWORD
| nice,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 22 2002
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EXTENSIONS
| More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), May 23 2002
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