51870

Appears in sequences

• Denominator of (2n+1) B_{2n}, where B_n are the Bernoulli numbers.at n=18A006955
• Triangle read by rows in which row n contains first n numbers with exactly n distinct prime factors.at n=19A048692
• Denominator of (n+1)*Bernoulli(n).at n=36A050932
• Numbers k such that phi(k) < k/5.at n=4A066765
• Numbers k such that sigma(prime(k) - 1) == 0 (mod k).at n=37A067758
• Products of exactly 6 distinct primes.at n=4A067885
• Numbers with six distinct prime divisors.at n=4A074969
• Smallest number beginning with 5 and having exactly n distinct prime divisors.at n=5A077330
• First occurrence (*2) of n in A088627 - or - least number that yields n different primes if you factorize it in all possible ways in two factors and add these factors.at n=22A091350
• Let B(n)(x) be the Bernoulli polynomials as defined in A001898, with B(n)(1) equal to the usual Bernoulli numbers A027641/A027642. Sequence gives denominators of B(n)(2).at n=37A100616
• Smallest number beginning with 5 that is the product of exactly n distinct primes.at n=5A106415
• a(n) = denominator(Bernoulli(prime(n) - 1))/prime(n).at n=11A110936
• Multiples of 1729, the Hardy-Ramanujan number.at n=30A138129
• Denominator of the coefficient [x^1] of the Bernoulli twin number polynomial C(n,x).at n=37A140219
• Denominator of the coefficient [x^1] of the Bernoulli twin number polynomial C(n,x).at n=36A140219
• Least number k such that all coefficients of k*B(n,x), the n-th Bernoulli polynomial, are integers.at n=37A144845
• L-matrix for Euler numbers A000111(n+1).at n=39A147315
• Records in A152235.at n=38A152452
• Averages of twin prime pairs of A074378.at n=16A154563
• a(n) = A027642(n-1) / A089026(n).at n=36A166120