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 A176167 First of a triple of consecutive integers, each the product of 4 distinct primes. 6
 203433, 214489, 225069, 258013, 294593, 313053, 315721, 352885, 389389, 409353, 418845, 421629, 452353, 464385, 478905, 485133, 500905, 508045, 508989, 526029, 528409, 538745, 542269, 542793, 548301, 556869, 559689, 569065, 571233, 579885 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A subsequence of A242607 and A016813. - M. F. Hasler, May 19 2014 LINKS Zak Seidov, Table of n, a(n) for n = 1..1000 EXAMPLE 203433 is a term: 203433 = 3*19*43*83, 203434 = 2*7*11*1321, 203435 = 5*23*29*61. MATHEMATICA f1[n_]:=Last/@FactorInteger[n]=={1, 1, 1, 1}; f2[n_]:=Max[Last/@FactorInteger[n]]; lst={}; Do[If[f1[n]&&f1[n+1]&&f1[n+2], AppendTo[lst, n]], {n, 5*8!, 7*9!}]; lst PROG (PARI) forstep(n=1+10^5, 10^7, 4, for(k=n, n+2, issquarefree(k)||next(2)); for(k=n, n+2, omega(k)==4||next(2)); print1((n)", ")) \\ M. F. Hasler, May 19 2014 CROSSREFS Cf. A039833, A066509, A192203. Subsequence of A140078 and of A318896. Sequence in context: A184455 A369898 A210017 * A248203 A235854 A203911 Adjacent sequences: A176164 A176165 A176166 * A176168 A176169 A176170 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, Apr 10 2010 STATUS approved

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Last modified May 29 08:50 EDT 2024. Contains 372926 sequences. (Running on oeis4.)