Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #9 Sep 24 2016 10:49:27
%S 0,1,1,2,3,4,1,5,2,6,7,8,3,9,4,10,11,12,13,14,15,16,17,18,1,19,5,20,
%T 21,22,2,23,6,24,25,26,7,27,8,28,29,30,31,32,33,34,35,36,3,37,9,38,39,
%U 40,4,41,10,42,43,44,11,45,12,46,47,48,49,50,51,52,53,54,13,55,14,56,57,58,15,59,16,60,61,62,17,63,18,64
%N Index of column where n is located in array A276953 (equally: row in A276955).
%C a(0) = 0 by convention, because 0 is not present in arrays A276953 and A276955.
%H Antti Karttunen, <a href="/A276951/b276951.txt">Table of n, a(n) for n = 0..5040</a>
%H <a href="/index/Fa#facbase">Index entries for sequences related to factorial base representation</a>
%F a(0) = 0; for n >= 1, if A260736(n) > 0 [when A276950(n) is not zero, when n is in A273670], then a(n) = A276952(n) = 1 + A273663(n), otherwise a(n) = a(A266193(n)).
%F Other identities. For all n >= 0:
%F a(n) = A257681(A275847(n)).
%o (Scheme) (definec (A276951 n) (cond ((zero? n) n) ((not (zero? (A276950 n))) (A276952 n)) (else (A276951 (A266193 n)))))
%Y Cf. A260736, A266193, A273670, A276950, A276952, A273663.
%Y Cf. arrays A276953 & A276955. A276949 gives their other index.
%Y Cf. also A257681, A275847.
%K nonn,base
%O 0,4
%A _Antti Karttunen_, Sep 22 2016