A116116
Numbers k such that k concatenated with k-6 gives the product of two numbers which differ by 2.
Original entry on oeis.org
21, 30, 902406, 959721, 6040059046, 6242406405, 9842410005, 9900249006, 15033519988494, 17250863148969, 22499666270469, 27632040031654, 34182546327286, 37487353123861, 52213551379230, 74230108225630
Offset: 1
9900249006//9900249000 = 9949999500 * 9949999502, where // denotes concatenation.
A116101
Numbers k such that k concatenated with k-8 gives the product of two numbers which differ by 1.
Original entry on oeis.org
40, 54999166056446260156057520, 57975463942945155043148110, 71745828111009107426351428, 75139610610667830220414750, 1640418113875534941913761115401064
Offset: 1
40//32 = 63 * 64, where // denotes concatenation.
A116120
Numbers k such that k concatenated with k-5 gives the product of two numbers which differ by 1.
Original entry on oeis.org
7, 55, 5255, 6295, 75511, 92137, 5551405, 7943911, 1257669432489239675, 2148743977942130765, 2877834685014859837, 4164942361780146967, 10235898967817894552965, 15389481849681116007757
Offset: 1
A116246
n times n+1 gives the concatenation of two numbers m and m-6.
Original entry on oeis.org
76, 3940697271069731588503127963131864400305034240, 4151390954867901940837042502762708788079731027, 4640791465716781132715600310864305127175798262
Offset: 1
76 * 77 = 58//52, where // denotes concatenation.
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