| 21. | The formula which is already in arithmetic progression?
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| 22. | In the case of primes containing an arithmetic progression, Karatsuba proved that this limit is infinite.
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| 23. | As of 2011, the longest known arithmetic progression of " consecutive " primes has length 10.
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| 24. | Much of her work has focused on arithmetic progressions, in particular extensions of the Green Tao theorem.
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| 25. | The 30? 60? 90?triangle is the only right triangle whose angles are in an arithmetic progression.
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| 26. | An arithmetic progression is a sequence of numbers in which the difference between adjacent numbers remains constant.
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| 27. | The 3 : 4 : 5 triangles are the only right triangles with edges in arithmetic progression.
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| 28. | If you add a red 9, then the red 3, 6, and 9 are in arithmetic progression.
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| 29. | Linnik's theorem ( 1944 ) concerns the size of the smallest prime in a given arithmetic progression.
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| 30. | Note that in an arithmetic progression 1 + 2 + 3 + 4 + 5 = 15.
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