login
A235045
Fixed points of permutations A235041/A235042.
8
0, 1, 2, 3, 4, 6, 7, 8, 11, 12, 13, 14, 16, 19, 22, 24, 26, 28, 31, 32, 37, 38, 41, 44, 47, 48, 52, 56, 59, 61, 62, 64, 67, 73, 74, 76, 82, 88, 94, 96, 97, 103, 104, 109, 111, 112, 118, 122, 123, 124, 128, 131, 134, 135, 137, 146, 148, 152, 157, 159, 164, 167
OFFSET
1,3
LINKS
EXAMPLE
In the following examples, X stands for the carryless multiplication of GF(2)[X] polynomials (A048720):
3 is a member, because it is in A091206, thus by definition fixed by A235041/A235042.
41 is a member for the same reason.
123 is a member, because 123 = 3*41, thus A235041(123) = A235041(3) X A235041(41) = 3 X 41 = A048720(3,41) = 123. That is, we happen to get the same result back as 3, '11' in binary, and 41, '101001' in binary, can be multiplied together to 123, '1111011' in binary, without producing any carries.
135 is a member, because 135 = 3*3*3*5, thus A235041(135) = A235041(3) X A235041(3) X A235041(3) X A235041(5) = 3 X 3 X 3 X 25 = 15 X 25 = 135.
PROG
(Scheme, with Antti Karttunen's IntSeq-library, two alternative definitions)
(define A235045 (FIXED-POINTS 1 0 A235041))
(define A235045v2 (FIXED-POINTS 1 0 A235042))
CROSSREFS
The sequence differs from its subsequence A235032 for the first time at n=54, where a(54)=135, while A235032(54)=137.
A091206 gives the prime terms.
Sequence in context: A175413 A192048 A235035 * A235032 A242925 A336444
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 02 2014
STATUS
approved