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Search: id:A066027
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| A066027 |
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Sum of digits of n minus product of digits of n is prime. |
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+0
2
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| 20, 30, 50, 70, 101, 102, 104, 106, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 131, 140, 141, 151, 160, 161, 171, 181, 191, 200, 201, 203, 205, 209, 210, 211, 230, 250, 290, 300, 302, 304, 308, 311, 320, 340, 380, 401, 403, 407, 409, 410
(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(11)=112 because 1+1+2=4 and 2*1*1=2 and 4-2=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(SumD(m) - ProdD(m)), write("b066027.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. A066024, A038369.
Sequence in context: A120145 A104048 A078499 this_sequence A142342 A008444 A066214
Adjacent sequences: A066024 A066025 A066026 this_sequence A066028 A066029 A066030
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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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