A243073 Third-order Bulgarian solitaire operation on partition list A112798: a(1) = 1, a(n) = A000040(A001222(n)) * A243072(A064989(n)).

1, 2, 4, 3, 8, 6, 16, 5, 9, 12, 24, 10, 40, 24, 18, 7, 56, 15, 88, 20, 36, 36, 104, 14, 27, 60, 25, 40, 136, 30, 152, 11, 54, 84, 54, 21, 184, 132, 90, 28, 232, 60, 248, 60, 50, 156, 296, 22, 108, 45, 126, 100, 328, 35, 81, 56, 198, 204, 344, 42, 376, 228, 100, 13, 135

Offset

1,2

Comments

The usual (first-order) Bulgarian Solitaire operation (cf. A242424) applied to an unordered integer partition means: subtract one from each part, and add a new part as large as there were parts in the old partition.

The "Second-Order Bulgarian Operation" means that after subtracting one from each part of the old partition (and discarding the parts that diminished to zero), we apply the (first order) Bulgarian operation to the remaining partition before adding a new part as large as there were parts in the original partition.

Similarly, in "Third-Order Bulgarian Solitaire Operation", we apply the Second-Order Bulgarian operation to the remaining partition (after we have subtracted one from each part) before adding a new part as large as there were parts in the original partition.

In this context, where the parts of partitions are encoded with the indices of primes in the prime factorization of n (as in A112798), A064989(n) gives the remaining partition after one has been subtracted from each part; A243072 applies the second-order Bulgarian operation to it; and multiplying with A000040(A001222(n)) adds a part as large as there originally were parts.

Links

Antti Karttunen, Table of n, a(n) for n = 1..8192

Formula

a(1) = 1, a(n) = A000040(A001222(n)) * A243072(A064989(n)) = A105560(n) * A243072(A064989(n)).

a(n) = A241909(A243053(A241909(n))).

Prog

(Scheme, with Antti Karttunen's IntSeq-library)
(definec (A243073 n) (if (<= n 1) n (* (A000040 (A001222 n)) (A243072 (A064989 n)))))

Crossrefs

Row 3 of A243070. Differs from A122111 for the first time at n=11.

Cf. A242424, A243072, A112798, A105560, A000040, A001222, A064989, A243053, A241909.

Sequence in context: A295029 A338918 A329605 * A243345 A297499 A243287

Adjacent sequences: A243070 A243071 A243072 * A243074 A243075 A243076

Keyword

nonn

Author

Antti Karttunen, May 29 2014

Status

approved