25545

Appears in sequences

• Numbers k such that phi(k) = phi(k+1).at n=22A001274
• Squarefree numbers k such that phi(k) = phi(k+1).at n=12A063739
• Expansion of x*(12 +101*x -189*x^2)/((1+2*x)*(1-3*x)*(1-5*x)).at n=5A120662
• The sum of the elements within a jump in a Sieve of Eratosthenes table.at n=31A179545
• Number of (n+1) X 2 0..1 arrays with the permanents of 2 X 2 subblocks nondecreasing rightwards and downwards.at n=7A204716
• T(n,k) = Number of (n+1) X (k+1) 0..1 arrays with the permanents of 2X2 subblocks nondecreasing rightwards and downwards.at n=28A204723
• T(n,k) = Number of (n+1) X (k+1) 0..1 arrays with the permanents of 2X2 subblocks nondecreasing rightwards and downwards.at n=35A204723
• T(n,k) is the number of (n+1) X (k+1) 0..1 arrays with rows and columns of permanents of all 2 X 2 subblocks lexicographically nondecreasing.at n=28A204962
• T(n,k) is the number of (n+1) X (k+1) 0..1 arrays with rows and columns of permanents of all 2 X 2 subblocks lexicographically nondecreasing.at n=35A204962
• Numbers k such that A206369(k) = A206369(k + 1).at n=23A206368
• Zeroless numbers k such that k - (sum of digits of k) and k - (product of digits of k) contain the same distinct digits as k.at n=6A248717
• Numbers n such that uphi(n) = uphi(n+1), where uphi(n) is the unitary totient function (A047994).at n=31A287055
• Numbers k such that iphi(k) = iphi(k+1), where iphi(k) is an infinitary analog to the Euler totient function (A091732).at n=27A326403
• Numbers k such that s(k) = s(k+1), where s(k) is the unitary analog of the alternating sum-of-divisors function (A307037).at n=15A333408
• Numbers k such that A173557(k) = A173557(k+1).at n=11A333874
• Numbers k such that both k and k+1 are squarefree and phi(k) = phi(k+1), where phi is the Euler totient function (A000010).at n=4A333875
• a(n) = Sum_{k=1..n} k^2 * floor(n/k)^2.at n=32A350123
• Total number of edges formed after n points have been placed in general position on each edge of a triangle (as in A365929).at n=9A366932
• Numbers k such that A384247(k) = A384247(k+1).at n=37A385743
• Array read by antidiagonals: Place k points in general position on each side of a regular n-gon and join every pair of the k*n boundary points by a chord; T(n,k) (n >= 3, k >= 0) gives the number of edges in the resulting planar graph.at n=45A392282