27305

Appears in sequences

• Divisors of 2^28 - 1.at n=36A003536
• Number of Gnutella users reachable with given connections and hops.at n=61A067066
• Generalized Jacobsthal numbers.at n=14A084640
• Indices of primes in sequence defined by A(0) = 43, A(n) = 10*A(n-1) + 53 for n > 0.at n=15A101735
• Triangular matrix T, read by rows, that satisfies: T^3 + 3T^2 + 3T = SHIFTUP(T), also T^(n+2) + 3T^(n+1) + 3T^n = SHIFTUP(T^n - D*T^(n-1)) for all n, where D is a diagonal matrix with diagonal(D) = diagonal(T) = {1,2,3,...}.at n=25A103237
• Sylvester dividends for Jacobsthal numbers.at n=27A105604
• a(n) = 5*(4^(n+1) - 1)/3.at n=6A146882
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (1, 0, 0), (1, 0, 1), (1, 1, -1)}.at n=8A150408
• A generalized Jacobsthal sequence.at n=13A159290
• Binomial transform of A006497.at n=7A228569
• Number of steps required by the Hwang-Deutsch merging algorithm.at n=26A260795
• Relative of Hofstadter Q-sequence: a(n) = max(0, n+27298) for n <= 0; a(n) = a(n-a(n-1)) + a(n-a(n-2)) + a(n-a(n-3)) for n > 0.at n=9A283888
• Odd numbers k such that A292270((k-1)/2) is a square < ((k-1)/2)^2.at n=25A292379
• Array read by antidiagonals: ((z+sqrt(x))/2)^k + ((z-sqrt(x))/2)^k for columns k >= 0 and rows n >= 0, where x = 4*n+1 and y = ceiling(sqrt(x)) and z = y+1-(y mod 2).at n=58A309853