64721

Appears in sequences

• Composite and every divisor (except 1) contains the digit 6.at n=17A062674
• Numbers n such that n = pi(n)*k + 1 for some k.at n=41A065136
• Numbers n such that there exists at least one number j and pi(m) = d_1 d_2 ... d_j*d_(j+1) d_(j+2) ... d_k where d_1 d_2 ...d_k is the decimal expansion of n.at n=37A112012
• Numbers m such that the sum of the first k odd primes = m-th odd prime.at n=36A179321
• Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.at n=15A193041
• Number of n X 6 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.at n=2A240270
• T(n,k)=Number of nXk 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.at n=30A240271
• Number of 3Xn 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.at n=5A240273
• Numbers n such that 5^n-4^(n-1) is prime.at n=9A272296
• E.g.f. satisfies A(x) = exp( x * ( exp(x) * A(x) )^2 ).at n=5A360547