185240

Appears in sequences

• Numbers n such that phi(4n+1) = sigma(n).at n=25A067234
• Triangle, read by rows, where row n equals the coefficients of y^k in R_{n-1}(y+y^2) for k=2..n, where R_n(y) is the n-th row polynomial in y for n>=2 with R_2(y)=y^2.at n=50A187115
• a(n) = (n - 1)*(n^3 + 1) = n^4 - n^3 + n - 1, for n >= 1.at n=20A242604