Search: id:A080500
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%I A080500
%S A080500 1,1,2,3,4,10,18,28,40,54,140,264,432,650,924,1260,1664,4284,8100,13376,
%T A080500 20400,29484,40964,55200,72576,93500,236808,443232,728000,1108380,
%U A080500 1603800,2235968,3028992,4009500,5206760,6652800,8382528,20867704
%N A080500 a(n) = (n-1)(n-4)(n-9)...(n-k^2) where k^2 < n <= (k+1)^2.
%C A080500 The idea of A080497 to A080500 when applied to Euler's phi function i.e. 
               on phi-torial function defined in A001783 yields A001783 itself for 
               obvious reasons. Is there any other such example?
%e A080500 a(6) = (6-1)(6-4)= 10.
%Y A080500 Cf. A080497, A080498, A072513.
%Y A080500 Sequence in context: A056701 A055506 A098088 this_sequence A007661 A049891 
               A135432
%Y A080500 Adjacent sequences: A080497 A080498 A080499 this_sequence A080501 A080502 
               A080503
%K A080500 nonn
%O A080500 1,3
%A A080500 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 19 2003
%E A080500 More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 
               06 2003

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