1565565

Appears in sequences

• Triangular numbers composed of digits {1,5,6}.at n=16A119132
• Composite squarefree numbers n such that p-tau(n) divides n+phi(n), where p are the prime factors of n, tau(n) = A000005(n) and phi(n) = A000010(n).at n=26A229321
• a(n) is the smallest triangular number that is a multiple of the product of the members of the n-th pair of twin primes.at n=6A344886