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Search: id:A116133
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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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+0
10
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| 64, 1876, 3214, 8776, 17227120144584448354, 19391087990479091186, 21557280540171744040, 23970390649400564404, 26051259424903756364, 28697643366269876506, 31320461807899711990, 34215988012600009664
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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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. - njas, Apr 11 2007
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EXAMPLE
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8776//8772 = 9364 * 9373, where // denotes concatenation. Also 8776//8780 = 9365 * 9372.
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CROSSREFS
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Cf. A116132, A116140, A116264.
Cf. A116180, A116187, A116189, A116195, A116319.
Sequence in context: A017115 A005609 A065788 this_sequence A010841 A022085 A017780
Adjacent sequences: A116130 A116131 A116132 this_sequence A116134 A116135 A116136
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KEYWORD
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nonn,base
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AUTHOR
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Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006
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EXTENSIONS
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Edited by njas, Apr 11 2007
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