84099

Appears in sequences

• Total number of positive integers < 10^n with multiplicative digital root value 5.at n=8A263473
• a(n) is the third number in a triple consisting of 3 numbers, which when squared are part of a right diagonal of magic square of squares.at n=4A273187
• Numbers k such that A(k+1) = A(k) + 3, where A() = A005100() are the deficient numbers.at n=31A317046
• G.f.: Sum_{k>=0} (1 + k*x)^k * x^(3*k).at n=25A360707