A304242 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A304242

Increasingly larger (in absolute value) extrema of the Mertens function A002321 between subsequent zeros.

1, -4, -6, -8, -9, -12, -15, -16, -25, -29, 35, -43, 51, -72, 73, -88, 96, -113, -132, -134, -154, 240, -258, -278, -368, 432, 550, -683, -847, 1060, -1078, 1240, -1447, -2573, 2845, -3448, -4610, -6226, 6695, -8565, 9132, 10246, -15335, -17334, 21777, -25071

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Values of A002321 at the indices listed in A304241.

These are those records of the absolute value of A002321 which are the maxima or minima between subsequent zeros. Figuratively speaking, these are the increasingly larger heights of the mountains or depths of the valleys of the graph of A002321.

LINKS

Bert Dobbelaere, Table of n, a(n) for n = 1..65

Bert Dobbelaere, C++ program for A304241 and A304242

G. Hurst, Computations of the Mertens Function and Improved Bounds on the Mertens Conjecture, arXiv:1610.08551 [math.NT], 2016-2017.

FORMULA

a(n) = A002321(A304241(n)).

PROG

(PARI) L=M=0; for(n=1, oo, if(m=merten(n), abs(m)>abs(M) && [M, N]=[m, n], abs(M)>abs(L) && (L=M) && print1(L", "); M=0))

(PARI) print1(j=1); for(i=1, #A051402-1, while( A028442[j] < A051402[i], j++); if( A028442[j-(j>1)]<=A051402[i] && A028442[j] < A051402[i+1], print1(", "A002321(A051402[i])))) \\ Using precomputed vectors A002321 and A051402, e.g. from the b-files: {c=0; AX=apply(t->fromdigits(digits(t)[#Str(c++)+1..-1]), readvec("/tmp/bX.txt"))}

CROSSREFS

Cf. A002321, A028442 (zeros of M), A051400, A051401, A051402 (where M, -M, |M| reaches k = 1, 2, 3, ...).

Cf. A304241, A304239, A304240.

Sequence in context: A258614 A269131 A130074 * A067012 A157942 A122786

Adjacent sequences: A304239 A304240 A304241 * A304243 A304244 A304245

KEYWORD

sign,hard

AUTHOR

M. F. Hasler, May 08 2018

EXTENSIONS

More terms from Bert Dobbelaere, Oct 30 2018

STATUS

approved