A367605 Final term of commas sequence (cf. A121805) if start at 1 and do the calculations in base n; or -1 if the sequence is infinite.

-1, 76, 6, 15612, 60466165, 823512, 262122, 32, 99999945, 1771460, 110, 2052, 289254654871, 8649755859206, 18446744073709551480, 83264, 1338258845052394702439737982907, 893871504, 10239999999942, 1801088480, 189, 148035426, 13501, 244140456, 3670344486987375

Offset

2,2

Comments

a(n) is written here in base 10. In base n the values are more revealing: they are -1, 2211_3, 12_4, 444422_5, 5555555541_6, 6666624_7, 777752_8, 35_9, and 99999945_10. That is, they consist of a possibly empty string of digits b-1 followed by a pair of digits xy with x+y = b-1 (see the theorem in A367341).

Links

Table of n, a(n) for n=2..26.

Crossrefs

Cf. A121805, A367341, A367604.

The sequences for bases 3, 8, and 10 are A367355, A367344, and A121805.

Sequence in context: A068942 A116234 A065669 * A126766 A088215 A033396

Adjacent sequences: A367602 A367603 A367604 * A367606 A367607 A367608

Keyword

sign

Author

N. J. A. Sloane, Dec 08 2023

Extensions

More terms from Michael S. Branicky, Dec 08 2023

Status

approved