105301

Appears in sequences

• a(n) = (n^2 - n + 1)*(n^2 + n + 1).at n=18A059826
• a(0)=0, a(1)=1, a(2n)=18*a(n), a(2n+1)=a(2n)+1.at n=21A197352
• Central polygonal numbers that are nontrivially the product of two central polygonal numbers.at n=23A203173
• Unitary hyperperfect numbers.at n=24A225150
• Positive integers k such that the decimal representation of 2^k ends with some permutation of the string "0123456789".at n=36A347164
• Composite numbers of the form k^2+k+1 all of whose prime factors are of that same form.at n=15A353056