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A116275 Numbers k such that k*(k+4) gives the concatenation of two numbers m and m-2. 5
8872, 9009, 83352840, 99000099, 329767122286, 670232877711, 738226276371, 933006600339, 999000000999, 3779410975143113, 3872816717528065, 4250291784692548, 4278630943941865, 4372036686326817, 4749511753491300 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

99000099 * 99000103 = 98010199//98010197, where // denotes concatenation.

CROSSREFS

Cf. A115426, A116267, A116274, A116276, A116288.

Sequence in context: A031625 A046506 A116242 * A116295 A115427 A236614

Adjacent sequences:  A116272 A116273 A116274 * A116276 A116277 A116278

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified June 30 02:41 EDT 2022. Contains 354913 sequences. (Running on oeis4.)