4 — this is the fourth time the Vikings have participated in the Hall of Fame Game and first since 1997; the Steelers have previously appeared in the game four times, including twice in the first three years of the game;

The previous Vikings appearances:

Aug. 8, 1970: Saints 14, Vikings 13 (attendance: 17,932)

Aug. 7, 1982: Vikings 30, Colts 14 (attendance: 23,379)

July 26, 1997: Vikings 28, Seahawks 26 (attendance: 23,846)

5 — number of preseason games this season for the Vikings and Steelers, including the Hall of Fame Game and next Saturday's hosting of Tampa Bay; the exhibition slate also includes a home game against Oakland and roadies at Dallas and Tennessee; the Vikings last played five preseason games in 1997 and went 3-2; Minnesota also had five preseason games in 1993 (including one at Berlin, Germany) and 1994 (including one at Tokyo, Japan)

6 — players who spent all or most of their careers with the Vikings have been enshrined in the past eight classes, including Mick Tingelhoff on Saturday; the other most recent inductees were: Cris Carter (2013), Chris Doleman (2012), John Randle (2010), Randall McDaniel (2009) and Gary Zimmerman (2008); a total of 13 players, coaches or administrators have been enshrined as Vikings

8 — offensive categories in which Steelers players led the AFC last season: Ben Roethlisberger passing yards (4,952) and completion percentage (67.1); Le'Veon Bell (290 rushing attempts for 1,361 yards); Antonio Brown (129 receptions, 1,698 receiving yards and 13 touchdowns)

9 — regular season games the Vikings will play against teams that use a 3-4 defensive front in 2015; the Vikings will see that base look from the Steelers and the Titans in the preseason, and in five of their first seven regular season games; 18 teams are using a 3-4 and 14 are using a 4-3 in base defense this season

10 — players in the Vikings 2015 draft class: Trae Waynes, Eric Kendricks, Danielle Hunter, T.J. Clemmings, MyCole Pruitt; Stefon Diggs; Tyrus Thompson, B.J. Dubose, Austin Shepherd and Edmond Robinson; and all are likely to play in the Hall of Fame Game; Pittsburgh's draft class has eight members, including first-round pick Bud Dupree

12 — based on last season's results, the Vikings have the 12th hardest strength of schedule awaiting in the 2015 regular season; Minnesota's upcoming opponents went 138-118 (.539 winning percentage a year ago); under the same metrics, the Steelers have the most difficult road ahead; Pittsburgh's foes in the near future went 147-107-2 (.579) in 2014

33 — sacks recorded and taken by the Steelers in 2014; the Vikings recorded 41 takedowns and suffered 51 sacks last season

47 — regular season receiving touchdowns by new Vikings receiver Mike Wallace in his first six seasons, including 32 for Pittsburgh in his first four seasons; Wallace caught 15 the past two seasons with Miami; of the 47:

0-20 yards: 19

21-40 yards: 14

41-plus yards: 14

64.4 — completion percentage of Teddy Bridgewater in starting 12 of the 13 games he played as a rookie; that number is third-highest all-time by a first-year player behind Roethlisberger's 66.4 percent in 2004 and Robert Griffin III's 65.6 percent in 2012