BOYERTOWN — Even after almost seven decades, the numbers are still clear as day.

171592 was tattooed in blue ink on Severin Fayerman’s left forearm by Nazi soldiers when he was just 19. It is the mark that identifies him as a prisoner — and survivor — of four concentration camps, including one of the most notorious in history: Auschwitz.

“It hurt, and it bled,” Fayerman said of the tattoo while speaking to sophomore students at Boyertown Area High School on Wednesday as part of the school district’s No Place For Hate program that promotes awareness of anti-Semitism, racism and all forms of bigotry.