7447440

Appears in sequences

• a(n) = denominator of Sum_{k=1..n} k^mu(n+1-k), where mu(m) = A008683(m).at n=31A130492
• a(n) is the denominator of Sum_{primes p < n} 1/(n-p).at n=32A305702
• Numbers of the form p^2-1 that have a record-breaking number of divisors, where p is prime.at n=18A323278
• Denominators of the partial alternating sums of the reciprocals of the unitary totient function (A047994).at n=31A379520
• Denominators of the partial alternating sums of the reciprocals of the unitary totient function (A047994).at n=32A379520