53956

Appears in sequences

• Triangular numbers with sum of digits = 28.at n=11A068132
• Triangular number x such that x + reverse of x is a prime.at n=13A072387
• Numbers n such that 2*p(n)+3, 2*p(n+1)+3, 2*p(n+2)+3 are consecutive primes, where p(i) denotes the i-th prime.at n=33A088066
• Sequence of distinct least triangular numbers such that the arithmetic mean of the first n terms is also a triangular number. Initial term is 0.at n=13A236415
• Triangular numbers n such that sigma(n) is a square number.at n=12A256151
• a(n) = 2*(3*n+1)*(9*n+8).at n=31A304506