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 A071256 Smallest multiple of n sandwiched between twin primes. 6
 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; text; internal format)
 OFFSET 1,1 COMMENTS Conjecture: lim sup n ->infinity a(n)/n^2 exists = C, where 0 0, s++]; s, {n, 1, 55}] (* Jean-François Alcover, Dec 08 2011, after Pari *) With[{tpm=Mean/@Select[Partition[Prime[Range[1000]], 2, 1], #[[2]]-#[[1]] == 2&]}, Flatten[Table[Select[tpm, Divisible[#, n]&, 1], {n, 60}]]] (* Harvey P. Dale, Apr 12 2012 *) PROG (PARI) for(n=1, 100, s=2; while(s%n+2-isprime(s-1)-isprime(s+1)>0, s++); print1(s, ", ")) CROSSREFS Cf. A071558 Sequence in context: A339719 A276683 A247343 * A078240 A296844 A332917 Adjacent sequences:  A071253 A071254 A071255 * A071257 A071258 A071259 KEYWORD nice,nonn AUTHOR Amarnath Murthy, May 22 2002 EXTENSIONS More terms from Benoit Cloitre, May 23 2002 STATUS approved

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Last modified June 20 02:17 EDT 2021. Contains 345154 sequences. (Running on oeis4.)