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A116258
Numbers k such that k*(k+9) gives the concatenation of two numbers m and m-5.
4
8444, 8809, 69125298546226023970, 69855225553525294043, 74604750601020544518, 75334677608319814591, 92496418993920707745, 93226346001219977818, 97975871048715228293, 98705798056014498366
OFFSET
1,1
EXAMPLE
8809 * 8818 = 7767//7762, where // denotes concatenation.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved