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A356396
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Nonnegative numbers k such that the negaFibonacci representation of -k (A215023(k)) is palindromic.
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1
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0, 2, 7, 20, 26, 44, 54, 73, 112, 143, 159, 196, 212, 264, 290, 350, 376, 426, 492, 518, 568, 675, 756, 798, 905, 986, 1028, 1125, 1167, 1280, 1361, 1403, 1500, 1542, 1683, 1751, 1908, 1976, 2107, 2290, 2358, 2515, 2583, 2714, 2887, 2955, 3086, 3275, 3343
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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The first terms are:
-- ---- -------------
1 0 0
2 2 1001
3 7 100001
4 20 10000001
5 26 10100101
6 44 1001001001
7 54 1000000001
8 73 1010000101
9 112 100100001001
10 143 100000000001
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PROG
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(PARI) is(n) = { my (v=0, neg=0, pos=0, f); n=-n; for (e=0, oo, f=fibonacci(-1-e); if (f<0, neg+=f, pos+=f); if (neg <=n && n <= pos, while (n, if (f<0, neg-=f, pos-=f); if (neg > n || n > pos, v+=2^e; n-=f); f=fibonacci(-1-e--)); my (b=binary(v)); return (b==Vecrev(b)))) }
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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