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Search: id:A062036
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| A062036 |
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Numbers whose product of digits is four times the sum of the digits. |
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+0
1
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| 88, 189, 198, 246, 264, 426, 462, 624, 642, 819, 891, 918, 981, 1247, 1274, 1344, 1427, 1434, 1443, 1472, 1724, 1742, 2147, 2174, 2226, 2262, 2417, 2471, 2622, 2714, 2741, 3144, 3414, 3441, 4127, 4134, 4143, 4172, 4217, 4271, 4314, 4341, 4413, 4431
(list; graph; listen)
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OFFSET
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0,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,500
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EXAMPLE
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1344 belong to the sequence as (1*3*3*4)/(1+3+3+4) =48/12 = 4.
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PROGRAM
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(PARI) SumD(x)= { s=0; while (x>9, s=s+x-10*(x\10); x\=10); return(s + x) } ProdD(x)= { p=1; while (x>9, p=p*(x-10*(x\10)); x\=10); return(p*x) } { n=-1; for (m=1, 10^7, if (ProdD(m)==4*SumD(m), write("b062036.txt", n++, " ", m); if (n==500, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 30 2009]
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CROSSREFS
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Sequence in context: A043522 A044420 A044801 this_sequence A116448 A046330 A001347
Adjacent sequences: A062033 A062034 A062035 this_sequence A062037 A062038 A062039
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KEYWORD
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nonn,base,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 27 2001
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), Jul 06 2001
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