25648

Appears in sequences

• dot_product(n,n-1,...2,1)*(7,8,...,n,1,2,3,4,5,6).at n=41A026066
• Numbers n such that 2*10^n + 7*R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=12A102959
• McKay-Thompson series of class 36b for the Monster group.at n=47A112173
• Number of n X 2 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.at n=11A240266
• Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape Y; triangle T(n,k), n>=0, read by rows.at n=37A247712
• Numbers k such that (7*10^k + 71)/3 is prime.at n=31A270831
• a(n) is the positive integer x such that 3^((M-1)/(2*p)) == -2^x (mod M), where p > 2 is prime, M=2^p-1 is the n-th Mersenne prime and x < p.at n=29A278792
• Number of nonempty subsets of {1..n} whose elements have an even root mean square.at n=23A357416