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A116130 Numbers k such that k concatenated with k-4 gives the product of two numbers which differ by 5. 10
8, 98, 590, 738, 830, 998, 1080, 4508, 9998, 20660, 29754, 99998, 980300, 999998, 6694218, 9999998, 49826988, 99999998, 117738578, 131505858, 132231404, 176445054, 177285320, 247979808, 252028388, 335180054, 336337790 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also numbers k such that k concatenated with itself gives the product of two numbers which differ by 3.

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

7531357568//7531357564 = 8678339452 * 8678339457, where // denotes concatenation.

CROSSREFS

Cf. A116124, A116129, A116131, A116099, A116261, A116163, A116136, A116125, A116287.

Sequence in context: A116267 A183334 A196327 * A302527 A303409 A264168

Adjacent sequences:  A116127 A116128 A116129 * A116131 A116132 A116133

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

EXTENSIONS

Edited by N. J. A. Sloane, Apr 13 2007

STATUS

approved

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Last modified July 6 15:57 EDT 2022. Contains 355111 sequences. (Running on oeis4.)