40309

Appears in sequences

• a(n) is the unique odd positive solution y of 2^n = 7x^2 + y^2.at n=28A077021
• Semiperimeter of primitive Pythagorean triangles having legs that add up to a square, sorted on hypotenuse.at n=25A089549
• Number of 0..5 arrays x(0..n-1) of n elements with each no smaller than the sum of its four previous neighbors modulo 6.at n=7A200466
• Lucas pseudoprimes.at n=32A217120
• Strong Lucas pseudoprimes.at n=8A217255
• Insert a dot after the first digit of a(n); this is now the beginning of the arithmetic mean of the digits used so far in the sequence. Lexicographically earliest sequence of distinct positive terms with this property.at n=27A335744