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A074458
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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.
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18
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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, 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, 9, 12, 10, 12, 8, 11, 11, 10, 11, 12, 10, 13, 11, 10, 6, 9, 9, 8, 9, 10, 8, 11
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OFFSET
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0,1
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COMMENTS
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LINKS
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FORMULA
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a(n) = a(n mod 10) + a(floor(n/10)) for n > 9.
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EXAMPLE
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LED display:
_ _ _ _ _ _ _ _
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so we have a(0) = 6, a(1) = 2, a(2) = 5 ...
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PROG
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(PARI) apply( {A074458(n)=digits(6255456475)[n%10+1]+if(n>9, self()(n\10))}, [0..99]) \\ M. F. Hasler, Jun 17 2020
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CROSSREFS
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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).
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KEYWORD
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nonn,base
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AUTHOR
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Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002
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EXTENSIONS
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STATUS
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approved
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