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 A267141 Number of weeks in n! seconds, for n >= 10. 0
 6, 66, 792, 10296, 144144, 2162160, 34594560, 588107520, 10585935360, 201132771840, 4022655436800, 84475764172800, 1858466811801600, 42744736671436800, 1025873680114483200, 25646842002862080000, 666817892074414080000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 10,1 COMMENTS 10! seconds = 6 weeks (exactly) 11! seconds = 66 weeks (exactly) 12! seconds = 792 weeks (exactly), etc. Demonstration of first term:   6 w * 7 d/w * 24 h/d * 60 m/h * 60 s/m  = seconds in 6 weeks =   (2*3)*(1*7)  *(3*8)  * (6*10) * (3*5*4) =   1*2*3*4*5*6*7*8*(3^2)*10                = 10! seconds LINKS Brady Haran, James Grime, 10!, Numberphile video (2012) FORMULA a(n) = 6*n!/10!. a(n) = 6*A051431(n-10), for n>=10. EXAMPLE For n=12, a(12) = 6*(12)!/10! = 792; interpretation: 12! seconds = 792 weeks. MATHEMATICA f[n_] := n!/(60*60*24*7); Array[f, 17, 10] (* Robert G. Wilson v, Jan 12 2016 *) PROG (PARI) a(n) = 6*n!/10!; \\ Altug Alkan, Jan 12 2016 CROSSREFS Cf. A051431. Sequence in context: A127857 A127858 A173535 * A004355 A282046 A124862 Adjacent sequences:  A267138 A267139 A267140 * A267142 A267143 A267144 KEYWORD easy,nonn AUTHOR Richard H. Sweetman, Jan 10 2016 STATUS approved

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Last modified August 19 16:22 EDT 2022. Contains 356229 sequences. (Running on oeis4.)