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A116351
Numbers k such that k*(k+5) gives the concatenation of two numbers m and m+9.
4
8446, 8811, 69125298546226023972, 69855225553525294045, 74604750601020544520, 75334677608319814593, 92496418993920707747, 93226346001219977820, 97975871048715228295, 98705798056014498368
OFFSET
1,1
EXAMPLE
8811 * 8816 = 7767//7776, where // denotes concatenation.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved