login
A116125
Numbers k such that k concatenated with k-5 gives the product of two numbers which differ by 6.
9
7, 97, 205, 300, 477, 732, 997, 1920, 3157, 9997, 52896, 99997, 120085, 427020, 999997, 8264460, 9999997, 88581312, 99999997, 112000885, 112917765, 143075580, 152863360, 193537077, 233788192, 266755221, 313680096
OFFSET
1,1
COMMENTS
Also numbers k such that k concatenated with itself gives the product of two numbers which differ by 4.
EXAMPLE
6786111717//6786111712 = 8237785936 * 8237785942, where // denotes concatenation.
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
EXTENSIONS
Edited by N. J. A. Sloane, Apr 15 2007
STATUS
approved