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A116353
Numbers k such that k*(k+7) gives the concatenation of two numbers m and m+9.
4
27, 67, 3416102887775247376839416334668636, 3756559953325598880263233435801765, 4313503800489302411917772257282209
OFFSET
1,1
EXAMPLE
67 * 74 = 49//58, where // denotes concatenation.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved