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Search: id:A066024
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| A066024 |
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Product of digits of n less the sum of digits of n is prime. |
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+0
2
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| 24, 25, 27, 29, 33, 34, 35, 37, 38, 42, 43, 45, 47, 49, 52, 53, 54, 56, 57, 59, 65, 67, 72, 73, 74, 75, 76, 78, 79, 83, 87, 92, 94, 95, 97, 125, 126, 128, 133, 144, 146, 148, 152, 162, 164, 166, 182, 184, 188, 215, 216, 218, 222, 223, 225, 227, 229, 232, 245, 247
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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a(1)=24 because 2+4=6 and 2*4=8 and 8-6=2 and 2 is prime
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PROGRAM
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(PARI) ProdD(x)= { local(p=1); while (x>9 && p>0, p*=x%10; x\=10); return(p*x) } SumD(x)= { local(s=0); while (x>9, s+=x%10; x\=10); return(s + x) } { n=0; for (m=1, 10^9, if (isprime(ProdD(m) - SumD(m)), write("b066024.txt", n++, " ", m); if (n==1000, return)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 07 2009]
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CROSSREFS
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Cf. A038369, A066027.
Sequence in context: A165845 A004513 A004465 this_sequence A123608 A141587 A027729
Adjacent sequences: A066021 A066022 A066023 this_sequence A066025 A066026 A066027
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KEYWORD
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easy,nonn,base,new
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AUTHOR
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Enoch Haga (Enokh(AT)comcast.net), Dec 11 2001
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EXTENSIONS
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EXAMPLE corrected by Harry J. Smith (hjsmithh(AT)sbcglobal.net), Nov 07 2009
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