A078758 Term in A064389 (variation (4) of Recamán's sequence) where n appears, or 0 if n never appears.

1, 4, 2, 35, 33, 3, 5, 16, 14, 12, 10, 8, 6, 188, 58, 186, 184, 23, 25, 7, 9, 11, 13, 15, 17, 182, 48, 46, 50, 1774, 1770, 1772, 1786, 1784, 1766, 40, 1764, 32, 34, 36, 22, 20, 18, 24, 26, 204, 202, 200, 198, 196, 194, 192, 190, 1758, 1762, 1760, 79, 77, 1782, 602

Offset

1,2

Comments

Is it ever 0?

If all a(n)>0, then this is the inverse permutation of A064389. - M. F. Hasler, Nov 03 2014

After 10^12 terms of A064389, the first unknown term of this sequence is 5191516. - Benjamin Chaffin, Oct 09 2016

Links

Benjamin Chaffin, Table of n, a(n) for n = 1..20000 [First 6655 terms from Nick Hobson]

Nick Hobson, Python program for this sequence

Index entries for sequences related to Recamán's sequence

Index entries for sequences that are permutations of the natural numbers

Prog

(PARI) for(i=1, 9e9, for(j=1, #a064389, a064389[j]==i&&print1(j", ")+next(2)); break) \\ The terms of A064389 must be stored in the vector a064389. - M. F. Hasler, Nov 03 2014

Crossrefs

Cf. A064389, A005132, A057167.

Sequence in context: A348567 A303085 A086482 * A364878 A102015 A302890

Adjacent sequences: A078755 A078756 A078757 * A078759 A078760 A078761

Keyword

nonn

Author

Reiner Martin, Jan 08 2003

Status

approved