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Revision History for A116180

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Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 7.
(history; published version)

#8 by Susanna Cuyler at Tue Jul 20 23:47:50 EDT 2021

STATUS

proposed

approved

#7 by Jon E. Schoenfield at Tue Jul 20 23:06:32 EDT 2021

STATUS

editing

proposed

#6 by Jon E. Schoenfield at Tue Jul 20 23:06:30 EDT 2021

NAME

Numbers n k such that n k concatenated with nk+3 gives the product of two numbers which differ by 7.

COMMENTS

Also numbers n k such that n k concatenated with nk-5 gives the product of two numbers which differ by 9.

Also numbers n k such that n k concatenated with nk+9 gives the product of two numbers which differ by 5.

STATUS

approved

editing

#5 by Russ Cox at Fri Mar 30 17:40:40 EDT 2012

AUTHOR

_Giovanni Resta (g.resta(AT)iit.cnr.it), _, Feb 06 2006

Discussion

Fri Mar 30

17:40

OEIS Server: https://oeis.org/edit/global/192

#4 by Russ Cox at Fri Mar 30 16:50:24 EDT 2012

EXTENSIONS

Edited by _N. J. A. Sloane (njas(AT)research.att.com), _, Apr 12 2007

Discussion

Fri Mar 30

16:50

OEIS Server: https://oeis.org/edit/global/110

#3 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009

KEYWORD

nonn,base,new

EXTENSIONS

Edited by N. J. A. Sloane (njas, (AT)research.att.com), Apr 12 2007

#2 by N. J. A. Sloane at Fri May 11 03:00:00 EDT 2007

NAME

Numbers n such that n concatenated with n+3 gives the product of two numbers which differ by 7.

COMMENTS

Also numbers n such that n concatenated with n-5 gives the product of two numbers which differ by 9.

Also numbers n such that n concatenated with n+9 gives the product of two numbers which differ by 5.

EXAMPLE

7767//7762 = 8809 * 8818.

7767//7776 = 8811 * 8816.

CROSSREFS

Cf. A116167, A116179, A116181, A116188, A116133, A116311.

Cf. A116114, A116126, A116133, A116258.

Cf. A116207, A116187, A116174, A116351.

KEYWORD

nonn,base,new

EXTENSIONS

Edited by njas, Apr 12 2007

#1 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006

NAME

n concatenated with n+3 gives the product of two numbers which differ by 7.

DATA

7137, 7767, 47783068991048776635, 48797525371338932241, 55658688122404752991, 56753136503494828605, 85555875266989354735, 86911515887391841491, 95992713077544748491, 97428345698747155255

OFFSET

1,1

EXAMPLE

7767//7770 = 8810 * 8817, where // denotes concatenation.

CROSSREFS

Cf. A116167, A116179, A116181, A116188, A116311.

KEYWORD

nonn,base

AUTHOR

Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006

STATUS

approved