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A116133
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Numbers n such that n concatenated with n-4 gives the product of two numbers which differ by 9.
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9
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64, 1876, 3214, 8776, 17227120144584448354, 19391087990479091186, 21557280540171744040, 23970390649400564404, 26051259424903756364, 28697643366269876506, 31320461807899711990, 34215988012600009664
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also numbers n such that n concatenated with n+4 gives the product of two numbers which differ by 7.
Since n(10^k+1) + 4 = m(m+7) iff n(10^k+1) - 4 = m(m+7) - 8 = (m-1)(m+8) = M(M+9) this is trivially the same sequence. - N. J. A. Sloane (njas(AT)research.att.com), Apr 11 2007
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EXAMPLE
| 8776//8772 = 9364 * 9373, where // denotes concatenation. Also 8776//8780 = 9365 * 9372.
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CROSSREFS
| Cf. A116132, A116140, A116264.
Cf. A116180, A116187, A116189, A116195, A116319.
Sequence in context: A005609 A065788 A203539 * A010841 A022085 A017780
Adjacent sequences: A116130 A116131 A116132 * A116134 A116135 A116136
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KEYWORD
| nonn,base
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AUTHOR
| Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 11 2007
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