OFFSET
0,3
COMMENTS
The Morse Code is written in current ITU standard.
For the number of dashes see A280916.
LINKS
Indranil Ghosh, Table of n, a(n) for n = 0..10000
Wikipedia, Morse code
Wikipedia, International Telecommunication Union
FORMULA
a(n) = A268643(A060109(n)) = floor(1+n/10)*5 - A280916(n) = a(floor(n/10)) + a(n%10) if n > 9 or min(n, 10-n) = 5 - |5 - n| otherwise, where % is the modulo (remainder) operator. - M. F. Hasler, Jun 22 2020
EXAMPLE
For n = 4, the Morse numeral representation of 4 is "....-" i.e., 4 dots. So, a(4) = 4.
For n = 26, the Morse numeral representation of 26 is "..--- -...." i.e, 6 dots. So, a(26) = 6.
MATHEMATICA
Table[Total[IntegerDigits[n]/.{6->4, 7->3, 8->2, 9->1}], {n, 0, 120}] (* Harvey P. Dale, Feb 06 2020 *)
PROG
(Python)
M={"1":".----", "2":"..---", "3":"...--", "4":"....-", "5":".....", "6":"-....", "7":"--...", "8":"---..", "9":"----.", "0":"-----"}
def A280913(n):
z="".join(M[i] for i in str(n))
return z.count(".")
print([A280913(n) for n in range(101)])
(PARI) apply( {A280913(n)=if(n>9, self()(n\10)+self()(n%10), 5-abs(n-5))}, [0..88]) \\ M. F. Hasler, Jun 22 2020
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Indranil Ghosh, Jan 10 2017
STATUS
approved