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Can you replace the question mark with a number?

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 137

The first user who solved this task is Alexander Filimonoff.

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Demetri Martin: Christmas Wrapping

I set a personal record on Christmas. I got my shopping done three weeks ahead of time. I had all the presents back at my apartment, I was halfway through wrapping them, and I realized, Damn, I used the wrong wrapping paper. The paper I used said, Happy Birthday. I didnt want to waste it, so I just wrote Jesus on it.

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Sir Arthur Stanley Eddington

Died 22 Nov 1944 at age 61 (born 28 Dec 1882). English astrophysicist, and mathematician known for his work on the motion, distribution, evolution and structure of stars. He also interpreted Einstein's general theory of relativity. He was one of the first to suggest (1917) conversion of matter into radiation powered the stars. In 1919, he led a solar eclipse expedition which confirmed the predicted bending of starlight by gravity. He developed an equation for radiation pressure. In 1924, he derived an important mass-luminosity relation. He also studied pulsations in Cepheid variables, and the very high densities of white dwarfs. He sought fundamental relationships between the prinicipal physical constants. Eddington wrote many books for the general reader, including Stars and Atoms.«

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