38874

Appears in sequences

• Denominator of (2n+1) B_{2n}, where B_n are the Bernoulli numbers.at n=45A006955
• a(n) = prime(2^n) + 1.at n=12A051440
• a(n) = n*(2*n^2 + 5*n + 13)/2.at n=33A163655
• Primitive (squarefree) elements of A199745.at n=30A200145
• Number of length 6 nonnegative integer arrays starting and ending with 0 with adjacent elements unequal but differing by no more than n.at n=11A205343
• Numbers k such that the first 9 digits of the k-th Lucas number are 1-9 pandigital.at n=10A216489
• Numbers n whose sum of divisors equals the sum of divisors of 2n+1.at n=14A272553
• Numbers n such that usigma(n) = usigma(2*n+1) where usigma(n) = A034448(n).at n=6A286837
• Number of n-digit left- or right-truncatable primes with no consecutive zero digits.at n=38A346662
• Numbers k such that sopfr(k + sopfr(k)) = sopfr(k) + sopfr(sopfr(k)), where sopfr = A001414.at n=39A376851