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A116116
Numbers k such that k concatenated with k-6 gives the product of two numbers which differ by 2.
5
21, 30, 902406, 959721, 6040059046, 6242406405, 9842410005, 9900249006, 15033519988494, 17250863148969, 22499666270469, 27632040031654, 34182546327286, 37487353123861, 52213551379230, 74230108225630
OFFSET
1,1
EXAMPLE
9900249006//9900249000 = 9949999500 * 9949999502, where // denotes concatenation.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
STATUS
approved