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Search: id:A066309
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| A066309 |
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n > (product of digits of n) * (sum of digits of n). |
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+0
2
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| 10, 11, 12, 13, 20, 21, 22, 30, 31, 32, 40, 41, 50, 51, 60, 61, 70, 71, 80, 81, 90, 91, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 130, 131, 132, 133, 134, 140, 141, 142
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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13 > (1*3)*(1+3) = 12, so 13 is a term of this sequence.
n=125, a[n]=(1+2+5).1.2.5=80<125, so 125 is here.
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MATHEMATICA
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asum[x_] := Apply[Plus, IntegerDigits[x]] apro[x_] := Apply[Times, IntegerDigits[x]] sz[x_] := asu[x]*apro[x] Do[s=sz[n]; If[Greater[n, s], Print[n]], {n, 1, 1000}]
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PROGRAM
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(ARIBAS): function a066312(a, b: integer); var n, k, j, p, d: integer; s: string; begin for n := a to b do s := itoa(n); k := 0; p := 1; for j := 0 to length(s) - 1 do d := atoi(s[j..j]); k := k + d; p := p*d; end; if n > p*k then write(n, ", "); end; end; end; a066312(0, 150).
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CROSSREFS
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Cf. A038369, A049101-A049106, A034710, A061672, A066306, A066307.
Sequence in context: A058945 A072554 A138582 this_sequence A107860 A058948 A108584
Adjacent sequences: A066306 A066307 A066308 this_sequence A066310 A066311 A066312
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KEYWORD
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base,nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu) and Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Dec 13 2001
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