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A116307 Numbers k such that k*(k+1) gives the concatenation of two numbers m and m+3. 4
83, 77394229, 89158935, 36623663376237623663376337, 37633762366336633762366237, 62366237633663366237633763, 63376336623762376336623663, 86194223018927804587702130 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

89158935 * 89158936 = 79493157//79493160, where // denotes concatenation.

CROSSREFS

Cf. A116099, A116301, A116308, A116314.

Sequence in context: A116263 A287686 A087532 * A093676 A221416 A130432

Adjacent sequences:  A116304 A116305 A116306 * A116308 A116309 A116310

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified July 31 15:25 EDT 2021. Contains 346374 sequences. (Running on oeis4.)