74025

Appears in sequences

• Numbers k such that 4^k - 2^k - 1 is prime.at n=38A098845
• Numbers k such that 4*k-1, 8*k-1, 16*k-1 and 32*k-1 are all primes.at n=30A101794
• Numbers k such that 4*k-1, 8*k-1, 16*k-1, 32*k-1 and 64*k-1 are all primes.at n=6A101994
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2 + (x+127)^2 = y^2.at n=11A129992
• Triangle read by rows: T(n,k) is the number of permutations of an n-set having k cycles of size > 1 (0<=k<=floor(n/2)).at n=34A136394
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 1), (-1, 0), (1, -1), (1, 0), (1, 1)}.at n=8A151308
• Solutions y of the Mordell equation y^2 = x^3 - 3a^2 + 1 for a = 0,1,2, ... (solutions x are given by the sequence A000466).at n=21A173202
• Number of permutations of [n] having exactly four nontrivial cycles.at n=2A289952
• Numbers that are divisible by the squares of two distinct primes and whose arithmetic derivative (A003415) is a squarefree number of the form 4k+2.at n=19A368697