For The Mathematically Inclined

What is the 2021st number in the series above?

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Problems from M-12/31/20

Problem 1

January 1st, 2021 falls on a Friday. Which is the next year when January 1st will fall on Friday?

Problem 2

On 1st January, 2021 a puppy ways 11 pounds. The puppy puts on 0.01 pounds of weight every 5 days until she reaches 20 pounds. After that she puts on 0.001 pounds ever 5 days when she reaches 30 pounds, 0.0001 pounds every 5 days when she reaches 40 pounds. When will the puppy or rather the dog weigh 50 pounds?

Congratulations Ramachandran Balakrishna.