114481

Appears in sequences

• Lexicographically earliest sequence of pairwise coprime triangular numbers.at n=22A034792
• Triangular numbers which are the product of two primes.at n=29A068443
• Triangular numbers whose sum of aliquot divisors is a prime number.at n=37A083676
• Triangular numbers that are also brilliant (A078972).at n=22A113940
• Triangular numbers composed of digits {1,4,8}.at n=1A119128
• Semiprimes in A006987(n), or semiprime binomial coefficients: C(n,k), 2 <= k <= n-2.at n=30A124000
• Product p*q of two primes with q = 2*p + 1.at n=16A156592
• Semiprimes of form p*q with p < q, such that 2^p - 1 == 0 (mod q).at n=19A179768
• Numbers n such that A229964(n) = 1.at n=19A229965
• Squarefree numbers (from A005117) with prime divisors in a 2p+1 progression.at n=21A231966
• Numbers n with the property that the symmetric representation of sigma(n) has four parts, each of width one and two regions meet at the center of the Dyck path.at n=26A264104
• The first of three consecutive triangular numbers the sum of which is equal to the sum of three consecutive primes.at n=34A298168
• Breadth-first reading of the subtree rooted at 7 of the tree where each parent node is the arithmetic derivative (A003415) of all its children.at n=55A327977
• Triangular numbers such that the sum of cubes of their digits is prime.at n=36A345351
• Triangular numbers that are the product of two distinct prime numbers of the form 4*k + 3.at n=7A365849
• Triangular numbers that are emirpimes.at n=9A375385