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
A116235
n times n+4 gives the concatenation of two numbers m and m-8.
Original entry on oeis.org
79, 8155, 9799, 467345, 532652, 997999, 76450587, 99979999, 7801738413, 8593817621, 9208120791, 9999799999, 346667333465, 401461854013, 598538145984, 653332666532, 945207479451, 999997999999, 48349470735058
Offset: 1
A116096
Numbers k such that k concatenated with k-9 gives the product of two numbers which differ by 4.
Original entry on oeis.org
21, 30, 902406, 959721, 6040059046, 6242406405, 9842410005, 9900249006, 15033519988494, 17250863148969, 22499666270469, 27632040031654, 34182546327286, 37487353123861, 52213551379230, 74230108225630
Offset: 1
9900249006//9900248997 = 9949999499 * 9949999503, where // denotes concatenation.
A116228
n times n+5 gives the concatenation of two numbers m and m-9.
Original entry on oeis.org
96011, 3812029082958589067221817215312, 6187970917041410932778182784684, 3189731673290266386838927279556315880
Offset: 1
96011 * 96016 = 92185//92176, where // denotes concatenation.
Showing 1-4 of 4 results.