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A116276 Numbers k such that k*(k+5) gives the concatenation of two numbers m and m-2. 5
70, 79822843, 69852478553064869297984899963805, 77473062193002372448027740546437, 77747359197583788609974143907617, 84341826458653210947638195982113, 85367942837521291760016984490249 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

79822843 * 79822848 = 63716866//63716864, where // denotes concatenation.

CROSSREFS

Cf. A028557, A116107, A116268, A116275, A116277, A116281.

Sequence in context: A222746 A066789 A103165 * A056666 A172680 A121338

Adjacent sequences:  A116273 A116274 A116275 * A116277 A116278 A116279

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified October 3 22:17 EDT 2022. Contains 357237 sequences. (Running on oeis4.)