Inside the Easter eggs at Taylor Swift’s 1st Switzerland Eras show

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Taylor Swift is nothing if not a numbers girl — and several of them lined up just right for her first Eras Tour show in Switzerland.

Swift, 34, is undoubtedly all about the numbers career-wise: the 14-time Grammy winner just became a billionaire, broke record after record with the Eras Tour, and keeps holding down the No. 1 spot on the Billboard Hot 100 with The Tortured Poets Department (though that chart success has not come without controversy). However, some of Swift’s most important figures have nothing to do with her wins, but instead are all about the meaning she has attributed to them. Such is the case with her Sunday, July 9, show in Zurich.

“This is actually our 113th show of the Eras Tour, and that’s my favorite number, which I never mention,” Swift told the sold-out crowd at Sunday night’s show. (The singer, whose birthday is December 13, has long held 13 as her lucky number.)

“I just thought since it was my favorite number, I’d do some of my favorite songs for the acoustic section,” she continued, treating the audience to a mashup of “All You Had to Do Was Stay” and “Right Where You Left Me,” which she performed on acoustic guitar.

But that wasn’t the only number-related Easter egg she dropped during the show. Swift also mashed up “Last Kiss” with “Sad, Beautiful, Tragic.”

“Last Kiss” — the Speak Now breakup ballad reminiscent of her 2008 split from Joe Jonas — contains the day’s date, July 9.

“I do recall now the smell of the rain / Fresh on the pavement, I ran off the plane,” Swift sang as she started to conclude the medley. “That July 9th, the beat of your heart / It jumps through your shirt, I can still feel your arms.”

Swift has paid tribute to significant numbers all throughout her Eras Tour — including her 87th show, a nod to boyfriend Travis Kelce‘s number on the Chiefs. The “We Are Never Ever Getting Back Together” artist — whose fourth and final Eras show in Paris on May 12 marked the 87th concert of the tour — acknowledged that fact on stage before performing “The Alchemy” (one of the two Tortured Poets Department tracks seemingly to specifically be about Kelce) while the Kansas City Chiefs tight end danced in the audience.