0,2

The discriminator of a finite sequence s is the smallest positive integer d such that all the elements of s are incongruent modulo d. The sequence in question is the discriminator of the first n powers of 2.

Table of n, a(n) for n=0..82.

Zhi-Wei Sun, On functions taking only prime values, J. Number Theory 133(2013), no.8, 2794-2812.

Sequence in context: A116920 A116919 A270429 * A167511 A242398 A174112

Adjacent sequences: A270094 A270095 A270096 * A270098 A270099 A270100

nonn

Jeffrey Shallit, Mar 11 2016

approved