39959

Appears in sequences

• Convolution of (1, p(1), p(2), ...) and composite numbers.at n=34A023627
• Numbers k such that sum of proper divisors or aliquot parts of k^2 (excluding 1) is a square, or A048050(k^2) is a square.at n=4A063900
• Odd numbers k for which 23 is the smallest positive i with Jacobi symbol J(i,k) != 1.at n=4A112079
• Least k such that n^k mod k = n-1.at n=16A128149
• a(n) = least k such that the remainder when 19^k is divided by k is n.at n=17A128159
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n), where a(0) = 1, a(1) = 4, b(0) = 2, b(1) = 3, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=18A295950