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A116107
Numbers k such that k concatenated with k-8 gives the product of two numbers which differ by 7.
8
52, 63716866, 48793687600063875363014809897052, 60020753655608135708762056127156, 60446518621981165303188950156776, 71135436903815748345367595855336, 72876856643103028189103298533248
OFFSET
1,1
COMMENTS
Also numbers n such that n concatenated with n-2 gives the product of two numbers which differ by 5.
EXAMPLE
63716866//63716864 = 79822843 * 79822848, where // denotes concatenation.
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
EXTENSIONS
Edited by N. J. A. Sloane, Apr 15 2007
STATUS
approved