/ for : {| class="wikitable" style="margin-left: auto; margin-right: auto; border: none;" |- style="vertical-align:center; text-align:center" ! Yearmodulo 28 || || 1700 2100 || 1800 2200 || 1900 2300 || Yearmodulo 28 |- | 06 17 23 || Jan Oct || Aug || Jun || Apr Jul || 06 17 23 |- | 01 07 18 || Apr Jul || May || Feb Mar Nov || Sep Dec || 01 07 18 |- | 02 13 19 || Sep Dec || Jan Oct || Aug || Jun || 02 13 19 |- | 03 14 25 || Jun || Apr Jul || May || Feb Mar Nov || 03 14 25 |- | 09 15 26 || Feb Mar Nov || Sep Dec || Jan Oct || Aug || 09 15 26 |- | 10 21 27 || Aug || Jun || Apr Jul || May || 10 21 27 |- | 05 11 22 || May || Feb Mar Nov || Sep Dec || Jan Oct || 05 11 22 |} See also 13 (number) Solar cycle (calendar) St. Brice's Day massacre Tycho Brahe days Footnotes References External links — multi-year calendar with Fri 13s marked — article examines S&P 500 index performance on Fri 13s — examines All Ordinaries Index ("All Ords") for 1 Jan 1985 – 12 Jan 1985 Luck Superstitions about numbers Superstitions of Europe Superstitions of the Americas Triskaidekaphobia Unofficial observances