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A281018
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Numbers with a prime number of dots and a prime number of dashes in their International Morse numeral representation.
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4
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2, 3, 7, 8, 12, 14, 16, 18, 21, 23, 25, 27, 29, 30, 32, 34, 36, 38, 41, 43, 47, 49, 50, 52, 58, 61, 63, 67, 69, 70, 72, 74, 76, 78, 81, 83, 85, 87, 89, 92, 94, 96, 98, 101, 109, 110, 190, 200, 355, 445, 454, 456, 465, 535, 544, 546, 553, 557, 564, 566, 575, 645
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OFFSET
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1,1
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COMMENTS
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This uses the current ITU standard Morse code.
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LINKS
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EXAMPLE
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PROG
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from sympy import isprime
i=0
j=1
while j<=1000:
print(str(j)+" "+str(i))
j+=1
i+=1
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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