18263

Appears in sequences

• Interprimes which are of the form s*prime, s=7.at n=19A075282
• a(n) = floor(e^(n*g)), where g = Euler's Gamma constant, 0.57721566490153...at n=17A090170
• Numbers k such that the k-th triangular number contains only digits {1,6,7}.at n=16A119141
• a(n) is the sum of all distinct integers that can be produced by reversing the digits of n in any base b >= 2.at n=56A211518
• a(n) is the least integer k such that there are n values of i <= k for which gpf(i^2 + 1) = gpf(k^2 + 1), where gpf(x) is the greatest prime factor of x.at n=26A258840