A116347
n times n+9 gives the concatenation of two numbers m and m+8.
Original entry on oeis.org
345, 647, 829, 878, 933, 33180, 42271, 57721, 66812, 316429537030539, 319485532390187, 328611858418903, 332707864512186, 339600869407914, 347417506407134, 355879196889561, 370588838784509, 383811170906508
Offset: 1
66812 * 66821 = 44644//44652, where // denotes concatenation.
A116354
n times n+8 gives the concatenation of two numbers m and m+9.
Original entry on oeis.org
365, 628, 771, 859, 9043, 81820, 366328, 633665, 7272729, 35294109, 64705884, 336663328, 340080963, 377622379, 400178770, 454545456, 477101847, 522898146, 545454537, 599821223, 622377614, 659919030, 663336665
Offset: 1
A116224
Numbers k such that k concatenated with k+9 gives the product of two numbers which differ by 9.
Original entry on oeis.org
23, 27, 10357253, 10577583, 45531191, 45991881, 12823841629508531559818193, 17153953024599261169512903, 34319291138166088695725681, 41203057971387248588060861, 75861857890090990570762781
Offset: 1
45991881//45991890 = 67817310 * 67817319, where // denotes concatenation.
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