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A088750 a(n) is the index of that zero of the Riemann zeta-function on the same line as the Gram point g(n-2). It is only well-defined if the Riemann hypothesis is true. 4
1, 2, 3, 4, 5, 7, 6, 8, 10, 9, 11, 13, 12, 14, 16, 15, 17, 18, 20, 19, 21, 24, 22, 23, 25, 27, 26, 28, 29, 32, 30, 31, 33, 35, 34, 36, 37, 40, 38, 39, 41, 44, 42, 43, 45, 46, 48, 47, 49, 50, 53, 51, 52, 54, 55, 57, 56, 58 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The zeros of the Riemann zeta-function are numbered. The ordinates being 0<gamma_1 < gamma_2<gamma_3 < ... The sequence refers to the number of the zero.

To make the relation between zeros and Gram points bijective we must associate the Gram points on a parallel line with the zero on the next parallel line above it. n->a(n) is a bijection of the natural numbers. For some absolute constant C and every n we have |n-a(n)|<C log n. By a theorem of Speiser the sequence is well-defined if and only if the hypothesis of Riemann is true. Some relations with the sequence A088749 that appear to be true for the first terms are not true in general. The sequence is given with some mistakes in the reference arXiv:math.NT/0309433.

The only way I know to obtain the sequence is to draw the curves Re zeta(s)=0 and Im zeta(s)=0.

LINKS

Juan Arias-de-Reyna, Table of n, a(n) for n = 1..79

J. Arias-de-Reyna, X-Ray of Riemann zeta-function, arXiv:math/0309433 [math.NT], 2003.

Juan Arias-de-Reyna, Further notes on A088750, September 2018.

A. Speiser, Geometrisches zur Riemannschen Zetafunktion, Math. Ann., Vol. 110 (1934), pp. 514-521.

EXAMPLE

a(9)=10 because the Gram point g(7)=g(9-2) is on the same sheet Im zeta(s)=0 that the tenth nontrivial zero of Riemann zeta function.

CROSSREFS

Cf. A088749.

Sequence in context: A145342 A248918 A318936 * A056018 A191673 A087465

Adjacent sequences:  A088747 A088748 A088749 * A088751 A088752 A088753

KEYWORD

hard,nonn

AUTHOR

Juan Arias-de-Reyna, Oct 15 2003

STATUS

approved

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Last modified July 6 11:37 EDT 2022. Contains 355110 sequences. (Running on oeis4.)