780625

Appears in sequences

• a(n) = n^2*(2*n^2 - 1); also Sum_{k=0..n-1} (2k+1)^3.at n=25A002593
• Images of hexamorphic numbers: suppose k-th hexagonal number H(k) (A000384) ends in k; sequence gives positive values of H(k).at n=13A038494
• Triangular numbers whose sum of aliquot divisors is also a triangular number.at n=14A083675
• a(n) = sqrt(A084004(n)).at n=32A084005
• Triangular numbers which are sums of 5 consecutive primes.at n=22A173421
• Triangular numbers of the form p*w, where p is a prime number and w is a prime power (A025475).at n=24A225674
• Triangular numbers that are the product of a square number and a prime number.at n=37A253653
• Composite numbers whose sum of unitary divisors is a multiple of the sum of their aliquot parts.at n=7A273813
• a(n) = n^2*(2*n^2 + (-1)^n).at n=25A275496
• Terms k of A228058 for which A325814(k) is a multiple of A034460(k).at n=8A325822
• Position of first occurrence of n in A331410.at n=17A329662
• Triangular numbers with exactly 10 divisors.at n=4A349699
• G.f. satisfies A(x) = 1 + x*A(x)^2 / (1 + x*A(x)^3).at n=14A363982