

A338249


Nonpositive values in A053985, in order of appearance and negated.


2



0, 2, 1, 8, 7, 10, 9, 4, 3, 6, 5, 32, 31, 34, 33, 28, 27, 30, 29, 40, 39, 42, 41, 36, 35, 38, 37, 16, 15, 18, 17, 12, 11, 14, 13, 24, 23, 26, 25, 20, 19, 22, 21, 128, 127, 130, 129, 124, 123, 126, 125, 136, 135, 138, 137, 132, 131, 134, 133, 112, 111, 114, 113
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OFFSET

0,2


COMMENTS

This sequence is a selfinverse permutation of the nonnegative integers (the offset has been set to 0 so as to get a permutation).
There is only one fixed point: a(0) = 0.


LINKS

Rémy Sigrist, Table of n, a(n) for n = 0..10922
Index entries for sequences that are permutations of the natural numbers


FORMULA

a(n) = A053985(A053754(n+1)) for any n >= 0.


EXAMPLE

A053985 = 0, 1, 2, 1, 4, 5, 2, 3, 8, 7, 10, 9, 4, 3, 6, 5, ...
We keep: 0, 2, 1, 8, 7, 10, 9, 4, 3, 6, 5, ...


PROG

(PARI) A053985(n) = fromdigits(binary(n), 2)
print (select(v > v<=0, apply(A053985, [0..147])))


CROSSREFS

Cf. A053754, A053985, A338248.
Sequence in context: A248052 A340629 A105672 * A214271 A262007 A005489
Adjacent sequences: A338246 A338247 A338248 * A338250 A338251 A338252


KEYWORD

nonn,base


AUTHOR

Rémy Sigrist, Oct 18 2020


STATUS

approved



