

A074458


Number of segments lit to display the number n on a 7segment display (as in pocket calculators): variant where '6', '7' and '9' use 6, 4 resp. 5 segments.


13



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

0,1


COMMENTS

Sequences A234691 and A234692 use one bit for each lit segment. See crossrefs for other variants.  M. F. Hasler, Jun 17 2020


LINKS

Table of n, a(n) for n=0..78.
Index entries for sequences related to calculator display


FORMULA

From M. F. Hasler, Jun 17 2020: (Start)
a(n) = a(n%10) + a(floor(n/10)) for n > 9, where % is the remainder operator.
a(n) = A006942(n)  A102679(n) + A102681(n). (End)


EXAMPLE

LED display:
_ _ _ _ _ _ _ _
   _ _ _ _ _   _ _
_  _ _  _ _  _ 
so we have a(0) = 6, a(1) = 2 and a(2) = 5 ...


PROG

(PARI) apply( {A074458(n)=digits(6255456475)[n%10+1]+if(n>9, self()(n\10))}, [0..99]) \\ M. F. Hasler, Jun 17 2020


CROSSREFS

Cf. A074459.
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).
Cf. A234691, A234692, A000120.
Sequence in context: A063720 A277116 A006942 * A010371 A270614 A011489
Adjacent sequences: A074455 A074456 A074457 * A074459 A074460 A074461


KEYWORD

nonn,base


AUTHOR

Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002


EXTENSIONS

Example edited by Jon E. Schoenfield, Jul 30 2017
Edited and extended to n > 9 by M. F. Hasler, Jun 17 2020


STATUS

approved



