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A359268
a(n) is the least k such that A359194(k) = A359194(n).
1
0, 1, 0, 3, 4, 1, 6, 7, 8, 9, 0, 11, 12, 13, 14, 15, 16, 17, 18, 3, 4, 1, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 6, 7, 8, 9, 0, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69
OFFSET
0,4
LINKS
FORMULA
a(n) = 0 iff n belongs to A020988.
a(n) = 1 iff n belongs to A002450 \ {0}.
EXAMPLE
The first terms, alongside A359194(n), are:
n a(n) A359194(n)
-- ---- ----------
0 0 1
1 1 0
2 0 1
3 3 6
4 4 3
5 1 0
6 6 13
7 7 10
8 8 7
9 9 4
10 0 1
11 11 30
12 12 27
PROG
(PARI) b(n) = if(n, bitneg(3*n, exponent(3*n)+1), 1)
a(n) = { my (v=b(n)); while (n, my (x=exponent(n)); if (b(n-2^x)==v, n-=2^x, break)); return (n) }
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Rémy Sigrist, Dec 23 2022
STATUS
approved