# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a074458 Showing 1-1 of 1 %I A074458 #27 Mar 09 2024 11:06:43 %S A074458 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 A074458 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 A074458 9,12,10,12,8,11,11,10,11,12,10,13,11,10,6,9,9,8,9,10,8,11 %N A074458 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 A074458 Sequences A234691 and A234692 use one bit for each lit segment. See crossrefs for other variants. - _M. F. Hasler_, Jun 17 2020 %H A074458 Index entries for sequences related to calculator display %F A074458 From _M. F. Hasler_, Jun 17 2020: (Start) %F A074458 a(n) = a(n mod 10) + a(floor(n/10)) for n > 9. %F A074458 a(n) = A006942(n) - A102679(n) + A102681(n). (End) %e A074458 LED display: %e A074458 _ _ _ _ _ _ _ _ %e A074458 | | | _| _| |_| |_ |_ | | |_| |_| %e A074458 |_| | |_ _| | _| |_| | |_| | %e A074458 . %e A074458 so we have a(0) = 6, a(1) = 2, a(2) = 5 ... %o A074458 (PARI) apply( {A074458(n)=digits(6255456475)[n%10+1]+if(n>9,self()(n\10))}, [0..99]) \\ _M. F. Hasler_, Jun 17 2020 %Y A074458 Cf. A074459. %Y A074458 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 A074458 Cf. A234691, A234692, A000120. %K A074458 nonn,base %O A074458 0,1 %A A074458 Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002 %E A074458 Example edited by _Jon E. Schoenfield_, Jul 30 2017 %E A074458 Edited and extended to n > 9 by _M. F. Hasler_, Jun 17 2020 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE