Search: id:A080498
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%I A080498
%S A080498 1,1,1,1,1,2,3,8,15,48,210,1152,3780,19200,62370,322560,2162160,
%T A080498 17418240,81081000,567705600,2481078600,16907304960,146659312800,
%U A080498 1504935936000,8799558768000,76435881984000,819678899239200
%N A080498 a(n) = (n-c_1)(n-c_2)...(n-c_k) where c_k is the k-th composite number 
               and is also the largest composite number < n.
%e A080498 a(6) = (6-4) = 2. a(10) = (10-4)(10-6)(10-8)(10-9) = 48.
%Y A080498 Cf. A080497, A072513, A080500.
%Y A080498 Sequence in context: A148012 A161178 A006882 this_sequence A148013 A133983 
               A005162
%Y A080498 Adjacent sequences: A080495 A080496 A080497 this_sequence A080499 A080500 
               A080501
%K A080498 nonn
%O A080498 1,6
%A A080498 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 19 2003
%E A080498 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 
               06 2003

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