55611

Appears in sequences

• Terms of A073872 that do not change their position in the rearrangement; i.e., values of A073872(n) which equal n(n+1)/2.at n=26A073873
• Triangular numbers whose sum of prime factors (with repetition) is also triangular.at n=29A076169
• a(n) = triangular number whose index is n concatenated n times.at n=2A077695
• Triangular numbers with palindromic indices.at n=42A089717
• Integers that are Rhonda numbers to base 8.at n=16A100970
• Hexagonal numbers with prime indices.at n=38A117961
• Triangular numbers composed of digits {1,5,6}.at n=10A119132
• Triangular numbers t such that t+10 is a prime.at n=41A129755
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, -1), (-1, 0, 1), (-1, 1, 1), (1, 0, 1), (1, 1, -1)}.at n=9A149317