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%I #27 Mar 09 2024 11:06:43
%S 6,2,5,5,4,5,6,4,7,5,8,4,7,7,6,7,8,6,9,7,11,7,10,10,9,10,11,9,12,10,
%T 11,7,10,10,9,10,11,9,12,10,10,6,9,9,8,9,10,8,11,9,11,7,10,10,9,10,11,
%U 9,12,10,12,8,11,11,10,11,12,10,13,11,10,6,9,9,8,9,10,8,11
%N Number of segments lit to display the number n on a 7-segment display (as in pocket calculators): variant where '6', '7' and '9' use 6, 4 resp. 5 segments.
%C Sequences A234691 and A234692 use one bit for each lit segment. See crossrefs for other variants. - _M. F. Hasler_, Jun 17 2020
%H <a href="/index/Ca#calculatordisplay">Index entries for sequences related to calculator display</a>
%F From _M. F. Hasler_, Jun 17 2020: (Start)
%F a(n) = a(n mod 10) + a(floor(n/10)) for n > 9.
%F a(n) = A006942(n) - A102679(n) + A102681(n). (End)
%e LED display:
%e _ _ _ _ _ _ _ _
%e | | | _| _| |_| |_ |_ | | |_| |_|
%e |_| | |_ _| | _| |_| | |_| |
%e .
%e so we have a(0) = 6, a(1) = 2, a(2) = 5 ...
%o (PARI) apply( {A074458(n)=digits(6255456475)[n%10+1]+if(n>9,self()(n\10))}, [0..99]) \\ _M. F. Hasler_, Jun 17 2020
%Y Cf. A074459.
%Y For other versions of this sequence, see A006942 (7 with one segment less), A063720 (6 and 7 with one segment less), A010371 (9 with one segment more), A277116 (7 with one segment less, 9 with one segment more).
%Y Cf. A234691, A234692, A000120.
%K nonn,base
%O 0,1
%A Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002
%E Example edited by _Jon E. Schoenfield_, Jul 30 2017
%E Edited and extended to n > 9 by _M. F. Hasler_, Jun 17 2020
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