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A116279 Numbers k such that k*(k+2) gives the concatenation of two numbers m and m-1. 4
36363636363, 45454545454, 54545454545, 63636363636, 72727272727, 81818181818, 90909090909, 428571428571428571428, 571428571428571428571, 714285714285714285714, 857142857142857142857 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

36363636363 * 36363636365 = 13223140496//13223140495, where // denotes concatenation.

CROSSREFS

Cf. A102567, A116273, A116280, A116286.

Sequence in context: A115502 A022262 A233849 * A106497 A204097 A295355

Adjacent sequences:  A116276 A116277 A116278 * A116280 A116281 A116282

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Feb 06 2006

STATUS

approved

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Last modified August 7 23:50 EDT 2022. Contains 355995 sequences. (Running on oeis4.)