

A116193


Numbers k such that k concatenated with k+5 gives the product of two numbers which differ by 5.


11



11, 45, 18281, 32769, 56891, 180689, 330539, 959481, 1850201, 3247409, 4940219, 2425563239, 2575561739, 6003563495, 7245212645, 7770160145, 4983798265289, 5049762270381, 5534298528989, 5603798594169, 21894082450101
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OFFSET

1,1


COMMENTS

Also numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 3. For proof that this is the same sequence compare A116133.
Also numbers k such that k concatenated with k9 gives the product of two numbers which differ by 9.


LINKS

Table of n, a(n) for n=1..21.


EXAMPLE

7770160145//7770160136 = 8814851183 * 8814851192, where // denotes concatenation.


CROSSREFS

Cf. A116205, A116187, A116349.
Cf. A116179, A115430, A116194, A116200, A116324.
Cf. A116099, A116109, A116231.
Sequence in context: A231438 A322560 A110114 * A282095 A063158 A081587
Adjacent sequences: A116190 A116191 A116192 * A116194 A116195 A116196


KEYWORD

nonn,base


AUTHOR

Giovanni Resta, Feb 06 2006


EXTENSIONS

Edited by N. J. A. Sloane, Apr 12 2007


STATUS

approved



