18569

Appears in sequences

• Numbers k such that k + sum of its prime factors = (k+1) + sum of its prime factors.at n=25A020700
• Numbers n such that A048767(n+1)=A048767(n).at n=21A048769
• Numbers n such that n + sum of prime factors of n = (n+1) + sum of prime factors of (n+1).at n=19A075654
• Integer part of square root of the reciprocal of a prime number multiplied by 10 to the power of the integer part of the square root of the number.at n=9A089244
• Integer part of square root of the reciprocal of a number multiplied by 10 to the power of the integer part of the square root of the number.at n=28A089245
• Unsigned row sums of triangle A118407.at n=27A118409
• Number of nondecreasing strings of numbers x(i=1..7) in -n..n with sum x(i)^3 equal to 0.at n=27A188281
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S)^2 (1 - 2 S).at n=9A291238
• Triangle read by rows, T(n,m) = Sum_{k=1..m} k*k!*(-1)^(m+k)*Stirling2(m,k)* C(2*n+k-2*m-1,n-m)/(n+k-m), for n >= 0 and 0 <= m <= n.at n=62A298753
• Numerator of the least probability that a particular fixed polyomino with n cells appears as the image of a simple random walk on the square lattice.at n=9A368002
• Odd numbers m for which A379113(m^2) > 1, i.e., k = m^2 has a proper unitary divisor d > 1 such that A048720(A065621(sigma(d)),sigma(k/d)) is equal to sigma(k).at n=36A379122