111628

Appears in sequences

• Triangular numbers in which the k-th significant digit either divides k or is a multiple of k.at n=32A069559
• Numbers of the form prime(n) + prime(n+1) - 2 that are also triangular numbers, T(k) = k(k+1)/2.at n=35A110891
• Triangular numbers equal to the sum of a prime number with its index.at n=36A115886
• Triangular numbers such that moving the first digit to the end produces a square number.at n=4A133197
• Triangular numbers whose sum of triangular divisors is also triangular and greater than 1.at n=5A209310
• Triangular numbers which are an average of four consecutive primes.at n=41A226196
• a(n) = (A001147(n+1)^2-1)/8, where A001147(n+1) = 3*5*...*(2n+1).at n=4A249348
• Number of Dyck paths of semilength n such that the minimal number of peaks over all positive levels equals ten.at n=14A288549
• Triangular numbers such that the sum of cubes of their digits is prime.at n=35A345351