19065

Appears in sequences

• Divisors of 2^20 - 1.at n=38A003529
• z-value of the solution (x,y,z) to 3/(2n+1) = 1/x + 1/y + 1/z satisfying 0 < x < y < z, odd x, y, z and having the largest z-value. The x and y components are in A075260 and A075261.at n=18A075262
• n+p(n)+p(p(n)) is a palindrome, where p(n) denotes the n-th prime.at n=34A116037
• a(n) = (2^A002326(n)-1)/(2*n+1).at n=27A165781
• Odd long legs `B` of more than one primitive Pythagorean triangle.at n=35A179271
• 41 times triangular numbers.at n=30A195038
• a(n) = (1/n)*A204983(n).at n=54A204984
• Number of nX6 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=4A239856
• T(n,k)=Number of nXk 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=49A239858
• Number of 5Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.at n=5A239862
• Number of nX4 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.at n=4A240889
• Number of nX5 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.at n=3A240890
• T(n,k)=Number of nXk 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.at n=31A240893
• T(n,k)=Number of nXk 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order.at n=32A240893
• Bases b where exactly eight primes p with p < b exist such that p is a base-b Wieferich prime.at n=8A325884
• Carmichael quotients to base 2: a(n) = (2^lambda(2*n-1)-1)/(2*n-1), where lambda is the Carmichael lambda function (A002322).at n=27A329238
• a(n) = (2^(A003558(n)) - A332433(n))/(2*n+1), for n >= 0.at n=27A329593
• Decreasing partition array based on the fractional parts of tan(n); see Comments.at n=55A389579