42570

Appears in sequences

• a(n) = n*(2*n-1)*(2*n+1).at n=22A035328
• Smallest number m such that when A051953 is applied n times to m the result is neither a power of 2 nor 0.at n=19A053476
• Smallest number m such that the trajectory of m under iteration of cototient function[=A051953] contains exactly n distinct numbers (including m and the fixed point=0). Or: the required number of iterations[=operations,transitions] is n-1.at n=26A098197
• Averages of twin primes such that the sum of the lower, average and upper parts of the twin primes are averages of other twin primes.at n=18A132929
• a(n) = 2662*n - 22.at n=15A157609
• Denominator of (n+3) / ((n+2) * (n+1) * n).at n=42A168061
• Number of positive integers with n digits whose digit sum is equal to its digit product.at n=44A297815
• Triangle, read by rows, where the n-th row lists the (n^2+1) coefficients of (1+2*x+...+(n+1)*x^n)^n.at n=44A329709
• Midpoints k of a pair of twin primes such that sigma(k) is also the midpoint of a pair of twin primes.at n=45A349981