1231230

Appears in sequences

• Product of (sum of first n primes) and (product of first n primes).at n=5A054972
• Ooguri-Vafa invariants of disk domain wall degeneracies for brane I in the O(K) -> P^1 X P^1 geometry.at n=5A061614
• Numbers n such that sum of distinct primes dividing n is divisible by the largest prime dividing n. Also n has exactly 7 distinct prime factors and n is squarefree.at n=0A071146
• Smallest squarefree number k with exactly n prime factors such that the sum of the prime factors is divisible by the largest prime dividing k, or 0 if no such k exists.at n=7A071147
• Products of 7 distinct primes (squarefree 7-almost primes).at n=14A123321
• Triangle read by rows: T(n,k) is the number of permutations of n elements with transposition distance equal to k, n >= 1 and 0 <= k <= A065603(n).at n=53A164366
• Numbers that are divisible by exactly 7 distinct primes.at n=16A176655
• a(n) = lcm(n,p1,p2,...,pk) for such a partition of n which maximizes this value among all partitions {p1+p2+...pk} of n.at n=41A225646
• Average of twin prime pairs n having their decimal expansion of the form abcabc or abcabc0 such that n contains three twin primes as divisors.at n=9A235716
• Numbers n such that phi(n), psi(n) and sigma(n) are simultaneously perfect squares.at n=31A301867
• Irregular triangle read by rows: T(n,k), 2 <= n , 3 <= k <= largest k such that A067175(k) <= n , is the smallest n-digit number m such that omega(m) = A001221(m) = k, and its largest prime factor equals the sum of its remaining prime factors. or -1 if no such number exists.at n=19A383677
• a(n) is the least number k such that omega(k) = n and the largest prime factor of k equals the sum of its remaining prime factors, where omega(k) = A001221(k).at n=4A383725
• Square array read by ascending antidiagonals, where row n lists numbers m such that omega(m) = n and the largest prime factor of m equals the sum of its remaining distinct prime factors, where omega(m) = A001221(m).at n=10A383726