23895

Appears in sequences

• (1+e)-harmonic numbers: harmonic mean of (1+e)-divisors is an integer.at n=13A053783
• Number of two-rowed partitions of length 4.at n=33A070557
• Sum of the prime factors of k equals half the sum of the prime factors of k + 1.at n=16A074213
• Values of z in solutions (x,y,z) to the Diophantine equation x^3-x^2+y^3-y^2=z^3-z^2, with 1<x<y<z arranged in order of increasing x.at n=21A138669
• a(n) = n*A007504(n)/2 = n*(sum of first n primes)/2.at n=30A156778
• Majority value maps: number of nX5 binary arrays indicating the locations of corresponding elements equal to at least half of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nX5 array.at n=2A220992
• T(n,k)=Majority value maps: number of nXk binary arrays indicating the locations of corresponding elements equal to at least half of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 nXk array.at n=23A220993
• Majority value maps: number of 3 X n binary arrays indicating the locations of corresponding elements equal to at least half of their horizontal, diagonal and antidiagonal neighbors in a random 0..3 3 X n array.at n=4A220995
• G.f. A(x) satisfies: Sum_{n>=0} Product_{k=1..n} x^(n+1-k) - A(x)^k = 1.at n=10A306088
• Numbers k such that 471*2^k+1 is prime.at n=44A318603
• 4*a(n) is the maximum possible determinant of a 3 X 3 matrix whose entries are 9 consecutive primes starting with prime(n).at n=14A340923