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A116133 Numbers n such that n concatenated with n-4 gives the product of two numbers which differ by 9. 9
64, 1876, 3214, 8776, 17227120144584448354, 19391087990479091186, 21557280540171744040, 23970390649400564404, 26051259424903756364, 28697643366269876506, 31320461807899711990, 34215988012600009664 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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, Apr 11 2007

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

8776//8772 = 9364 * 9373, where // denotes concatenation. Also 8776//8780 = 9365 * 9372.

CROSSREFS

Cf. A116132, A116140, A116264.

Cf. A116180, A116187, A116189, A116195, A116319.

Sequence in context: A283689 A226010 A203539 * A010841 A226558 A302856

Adjacent sequences:  A116130 A116131 A116132 * A116134 A116135 A116136

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

EXTENSIONS

Edited by N. J. A. Sloane, Apr 11 2007

STATUS

approved

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Last modified October 14 16:48 EDT 2019. Contains 328022 sequences. (Running on oeis4.)