Montgomery, H. L. Primes in arithmetic progressions. (English) Zbl 0209.34804 Mich. Math. J. 17, 33-39 (1970). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 5 ReviewsCited in 41 Documents MathOverflow Questions: Why is the Barban-Halberstam-Davenport theorem important? MSC: 11N13 Primes in congruence classes PDFBibTeX XMLCite \textit{H. L. Montgomery}, Mich. Math. J. 17, 33--39 (1970; Zbl 0209.34804) Full Text: DOI Online Encyclopedia of Integer Sequences: Least k such that sum_{i=1..k} 1/phi(i) >= n.