login
This site is supported by donations to The OEIS Foundation.

 

Logo

The OEIS is looking to hire part-time people to help edit core sequences, upload scanned documents, process citations, fix broken links, etc. - Neil Sloane, njasloane@gmail.com

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A062045 Numbers for which the product of the digits is 12 times their sum. 1
666, 1479, 1497, 1568, 1586, 1658, 1685, 1749, 1794, 1856, 1865, 1947, 1974, 2349, 2394, 2439, 2446, 2464, 2493, 2644, 2934, 2943, 3249, 3294, 3345, 3354, 3429, 3435, 3453, 3492, 3534, 3543, 3924, 3942, 4179, 4197, 4239, 4246, 4264, 4293, 4329, 4335, 4353, 4392, 4426, 4462, 4533, 4624, 4642, 4719, 4791, 4917, 4923, 4932, 4971, 5168, 5186, 5334, 5343, 5433, 5618, 5681, 5816, 5861, 6158, 6185, 6244, 6424, 6442, 6518, 6581, 6815, 6851, 7149, 7194, 7419, 7491, 7914 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Harry J. Smith, Table of n, a(n) for n=0,...,500

EXAMPLE

2349 belongs to the sequence as (2*3*4*9)/(2+3+4+9) = 216/18 = 12.

MATHEMATICA

okQ[n_]:=Module[{idn=IntegerDigits[n]}, Times@@idn/Total[idn]==12]

Select[Range[10000], okQ] (* Harvey P. Dale, Nov 25 2010 *)

PROG

(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)==12*SumD(m), write("b062045.txt", n++, " ", m); if (n==500, break)) ) } \\ Harry J. Smith, Jul 30 2009

CROSSREFS

Sequence in context: A093733 A133562 A202445 * A043515 A051003 A183655

Adjacent sequences:  A062042 A062043 A062044 * A062046 A062047 A062048

KEYWORD

nonn,base,easy

AUTHOR

Amarnath Murthy, Jun 28 2001

EXTENSIONS

Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jul 06 2001

More terms from Harvey P. Dale, Nov 25 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified May 27 11:14 EDT 2017. Contains 287204 sequences.