A116102
Numbers k such that k concatenated with k-8 gives the product of two numbers which differ by 2.
Original entry on oeis.org
16, 1337032, 2084503, 2953232, 4023943, 1330033613070195328, 4036108433661798551, 8283744867954114232, 6247320195351414276186411625291, 9452080202814205132771066881607
Offset: 1
4023943//4023935 = 6343455 * 6343457, where // denotes
concatenation.
A116226
n times n+2 gives the concatenation of two numbers m and m-9.
Original entry on oeis.org
4622, 5377, 7980, 34952, 46865, 53134, 65047, 7056186, 9783459, 43176670, 56823329, 97999800, 447255476452, 552744523547, 755424659534, 799319866013, 997999998000, 4297663349523, 5702336650476, 6971253996227
Offset: 1
97999800 * 97999802 = 96039609//96039600, where // denotes
concatenation.
-
A:= NULL: count:= 0:
for d from 2 to 40 do
R:= [msolve(x^2=-8,10^d+1)];
T:= sort(select(t -> t*(t+2) mod 10^d >= 10^(d-1), map(t -> subs(t,x-1),R)));
count:= count+nops(T);
A:= A, op(T);
od:
A; # Robert Israel, Jan 04 2021
A116234
n times n+3 gives the concatenation of two numbers m and m-8.
Original entry on oeis.org
75, 3940697271069731588503127963131864400305034239, 4151390954867901940837042502762708788079731026, 4640791465716781132715600310864305127175798261
Offset: 1
75 * 78 = 58//50, where // denotes concatenation.
A116247
n times n+2 gives the concatenation of two numbers m and m-6.
Original entry on oeis.org
45, 54, 949950, 979653, 7771781678, 7900890079, 9920892099, 9949999500, 38773083432316, 41534158410841, 47433813119407, 52566186880592, 58465841589158, 61226916567683, 72258945037434, 86156896546724
Offset: 1
A116232
n times n+1 gives the concatenation of two numbers m and m-8.
Original entry on oeis.org
63, 74161422624196105800027496, 76141620643998085998047298, 84702909106481760451088979, 86683107126283740649108781, 4050207542676714414981906222839967
Offset: 1
63 * 64 = 40//32, where // denotes concatenation.
Showing 1-5 of 5 results.