25963

Appears in sequences

• Numbers k such that k + phi(k) + phi(phi(k)) is a repdigit.at n=22A116027
• Sum of the digits of 5^(2^n).at n=13A124307
• Triangle T(n,k) = A008292(n+1,k+1) + A060187(n+1,k+1)- 1 read along rows 0<=k<=n.at n=24A176490
• Semiprimes of the form p^2 + pq + q^2, where p, q are consecutive primes.at n=11A243904
• On a spirally numbered square grid, with labels starting at 1, this is the number of the last cell that a (1,n) leaper reaches before getting trapped, or -1 if it never gets trapped.at n=4A323471
• Triangle read by rows: T(m,n) is the label of the ending square of an (m,n)-leaper (a generalization of a chess knight) when it can no longer move, starting on a board with squares spirally numbered, starting at 1; 1 <= n < m. Each move is to the lowest-numbered unvisited square.at n=6A323750
• G.f. satisfies A(x) = 1/(1-x)^2 + x*A(x)^3.at n=6A364620
• Number of integer partitions of n having a part that can be written as a nonnegative linear combination of the other (possibly equal) parts.at n=38A364913