Heptagonal number (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Heptagonal number" in English language version.

refsWebsite

Global rank English rank

1web.archive.org

1^st place

1^st place

207^th place

136^th place

psu.edu (Global: 207^th place; English: 136^th place)

math.psu.edu

"Beyond the Basel Problem: Sums of Reciprocals of Figurate Numbers" (PDF). Archived from the original (PDF) on 2013-05-29. Retrieved 2010-05-19.

web.archive.org (Global: 1^st place; English: 1^st place)

"Beyond the Basel Problem: Sums of Reciprocals of Figurate Numbers" (PDF). Archived from the original (PDF) on 2013-05-29. Retrieved 2010-05-19.