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A116296
Numbers k such that k*(k+3) gives the concatenation of two numbers m and m+1.
5
82, 77394228, 89158934, 36623663376237623663376336, 37633762366336633762366236, 62366237633663366237633762, 63376336623762376336623662, 86194223018927804587702129
OFFSET
1,1
EXAMPLE
89158934 * 89158937 = 79493157//79493158, where // denotes concatenation.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved