304200

Appears in sequences

• Numbers k with the property that k is a substring of its base-6 representation.at n=18A038106
• Variance of time for a random walk starting at 0 to reach one of the boundaries at +n or -n for the first time.at n=26A072819
• Numbers with prime factorization p^2*q^2*r^2*s^3 where p, q, r, and s are distinct primes.at n=4A190382
• v(n+1)/v(n), where v=A203766.at n=4A203767
• Number of (w,x,y,z) with all terms in {1,...,n} and w > |x-y| + |y-z|.at n=30A212674
• a(n) is the smallest number satisfying a(n)^2+1 = p(n)*q(n), p(n) < q(n) both prime, such that q(n+1)/p(n+1) < q(n)/p(n) with the initial condition q(1)/p(1) < 3/2.at n=19A261803
• Numbers n such that 2^n == 1 (mod sigma(n)).at n=40A278836
• a(n) is the smallest number k for which the width n at the diagonal is two smaller than the maximum width of the symmetric representation of sigma(k), the sum of divisors of k.at n=8A338538
• Numbers having exactly four non-unitary prime factors.at n=12A338541
• Numbers m such that m^2 + 1 = p*q with p, q primes and m = (p + q)/2 - 1.at n=15A348594
• Powerful numbers (A001694) whose sum of aliquot powerful divisors (including 1) is larger than 1 and is also powerful.at n=13A349110
• Primitive exponential admirable numbers: the powerful terms in A336680.at n=34A391283