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 A227179 After initial 0, integers from 0 to n(n-1) followed by integers from 0 to n(n+1) and so on. 5

%I

%S 0,0,0,1,2,0,1,2,3,4,5,6,0,1,2,3,4,5,6,7,8,9,10,11,12,0,1,2,3,4,5,6,7,

%T 8,9,10,11,12,13,14,15,16,17,18,19,20,0,1,2,3,4,5,6,7,8,9,10,11,12,13,

%U 14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30

%N After initial 0, integers from 0 to n(n-1) followed by integers from 0 to n(n+1) and so on.

%H Antti Karttunen, <a href="/A227179/b227179.txt">Table of n, a(n) for n = 0..9951</a>

%F a(n) = n - (1 + A006527(A227177(n)-1)).

%t Flatten[(Range[(#-2) (#-1)+1]-1&)[Range[7]]] (* _Peter J. C. Moses_, Jul 11 2013 *)

%o (Scheme): (define (A227179 n) (- n (+ 1 (A006527 (- (A227177 n) 1)))))

%Y Cf. A002378, A006527, A227177, A227181, A227182.

%K nonn

%O 0,5

%A _Antti Karttunen_, Jul 03 2013

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Last modified January 16 06:48 EST 2021. Contains 340204 sequences. (Running on oeis4.)