Logic Masters Deutschland e.V.

Wedding time! I am a bit busy today, this is a scheduled post :)

A little background... In the U.S., the date today is 8/13/21, which are three consecutive Fibonacci numbers (1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, etc)! These numbers correspond to the Fibonacci spiral seen on pineapples, pinecones, seashells, etc (hence the spiral in the puzzle). Fibonacci numbers are also used to compute the golden ratio (the ratio of limiting Fibonacci numbers), which is noted as the most aesthetically pleasing ratio between two sides of a rectangle. And this is the last date of the century in this form! (Although other runner-ups may include January 1, 2023 or November 23, 2058.) Enjoy the puzzle!

Rules: Normal sudoku rules apply. In cages, digits do not repeat and must sum to the number in the top left corner of the cage. Numbers outside the grid give the sum of the digits along the indicated diagonal. Digits along the diagonal may repeat if allowed by other rules. Digits along thermometers must increase from the bulb end.

F-puzzles link: https://f-puzzles.com/?id=yev9ycvw

CTC link: https://tinyurl.com/9ytbkwjn