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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A115429 Numbers n such that the concatenation of n with n+8 gives a square. 25
6001, 6433, 11085116, 44496481, 96040393, 115916930617, 227007035017, 274101929528, 434985419768, 749978863753, 996004003993, 1365379857457948, 1410590590957816, 1762388551055953, 2307340946901148, 2700383162251217 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also numbers n such that n concatenated with n+7 gives the product of two numbers which differ by 2.

Also numbers n such that n concatenated with n+4 gives the product of two numbers which differ by 4.

Also numbers n such that n concatenated with n-1 gives the product of two numbers which differ by 6.

Also numbers n such that n concatenated with n-8 gives the product of two numbers which differ by 8.

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

6001//6009 = 7747^2, where // denotes concatenation.

96040393//96040400 = 98000200 * 98000202.

96040393//96040397 = 98000199 * 98000203.

96040393//96040392 = 98000198 * 98000204.

CROSSREFS

Cf. A030465, A102567, A115426, A115437, A115428, A115430, A115431, A115432, A115433, A115434, A115435, A115436, A115440.

Cf. A116107, A116109, A116113, A116239.

Cf. A116205, A115430, A116335, A116185, A116187, A116317.

Cf. A116131, A116112, A116152, A116159, A116282.

Sequence in context: A171351 A068132 A250514 * A046395 A143043 A239176

Adjacent sequences:  A115426 A115427 A115428 * A115430 A115431 A115432

KEYWORD

base,nonn

AUTHOR

Giovanni Resta, Jan 24 2006

EXTENSIONS

Edited by N. J. A. Sloane, Apr 15 2007

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 August 22 10:37 EDT 2017. Contains 290946 sequences.