COEUR d'ALENE - Today is a special day for one Spirit Lake girl, and it's a sequentially significant calendar coincidence for math enthusiasts everywhere.

It's Kallysta Ingram's birthday - she's 11 on 12-13-14.

"I really, really think that I'll remember it for my whole life," Kallysta said Friday afternoon. "When I get older I want to tell my kids and stuff, I think that would be cool."

Her grandma, Laura Cary, contacted The Press to share the mathematical anomaly surrounding her granddaughter's 11th birthday.

"I'm a proud grandma," she said. "She's just a great kid. The apple of my eye. It's just such a significant birthday. She needs acknowledgment."

Dec. 13, 2014, is in line with other interesting sequential and coincidental calendar dates, such as Jan. 1, 2001 (01-01-01), March 4, 2005 (03-04-05) or Nov. 12, 2013 (11-12-13). It will be almost 90 years before a date like 01-01-01 reappears. Many couples get married on these dates, but to actually have a birthday that falls on one is something that isn't usually planned.

"I don't think it happens very often to many people," Cary said. "I don't think it's ever happened to me."

The sequential birthday girl, Kallysta, is a North Idaho STEM Charter Academy fifth-grader who sings in junior choir and wants to be a veterinarian. While she and her friends probably won't be celebrating by solving complex mathematical equations involving sequences, she said they will have a sleepover and enjoy a giant cookie birthday cake.

"There won't be a 2014 again," Kallysta said, her hazel eyes twinkling. "I found out about it like, two years ago, and I've been waiting for it because I thought it would be really cool and fun."

Three sequential numbers in a calendar date won't appear again until Jan. 2, 2103 (01-02-03), but other interesting sequences will occur from time to time, such as March 3, 2033 (03-03-33).