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A116094
Numbers k such that k concatenated with k-9 gives the product of two numbers which differ by 1.
3
15, 771, 939, 2099721, 2935179, 5235841, 5424812334857206131, 6846608332924813315, 1458115445754267551129074204621, 3821059872421656136462055529015, 5557540612916539470512122318065
OFFSET
1,1
EXAMPLE
5235841//5235832 = 7235911 * 7235912, where // denotes
concatenation.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved