194923

Appears in sequences

• Strong pseudoprimes to base 33.at n=29A020259
• a(n) = (n^2 - n + 1)*(n^2 + n + 1).at n=21A059826
• Replace 2^i with n^i in binary representation of n.at n=20A104258
• Central polygonal numbers that are nontrivially the product of two central polygonal numbers.at n=27A203173
• Semiprimes m = p*q where m, p and q are in A033638 (locations of right angle turns in Ulam square spiral).at n=14A331997
• Composite numbers of the form k^2+k+1 all of whose prime factors are of that same form.at n=18A353056