98346

Appears in sequences

• Triangular numbers in which the sum of the external digits equals the sum of the internal digits.at n=25A088289
• Numbers of the form prime(n) + prime(n+1) - 2 that are also triangular numbers, T(k) = k(k+1)/2.at n=33A110891
• Triangular numbers p*(p+1)/2 with p prime such that 1+(number of prime factors of p+1) is prime.at n=35A144549
• Triangular numbers t such that all the digits needed to write the consecutive triangular numbers from 0 to t fill exactly an equilateral triangle (no holes, no overlaps).at n=25A158030
• Triangular numbers that remain triangular numbers when their reverse is added.at n=10A167220
• The first of two consecutive triangular numbers the sum of which is equal to the sum of two consecutive prime numbers.at n=27A298462
• G.f. A(x) satisfies: A(x) = 1 + Sum_{k>=1} k*x^k*A(x)^k/(1 + x^k*A(x)^k).at n=10A307401