33031

Appears in sequences

• Beginning of n consecutive quadratic residues mod A025046(n).at n=35A048282
• Sum of terms of n-th row of A077321.at n=16A077324
• Numerator of Sum_{i=2..n} (-1)^i/(i*phi(i)).at n=9A101992
• Composite numbers and 1 which yield a prime whenever a 3 is inserted anywhere in them (including at the beginning or end).at n=27A216166
• Products of three distinct strong primes.at n=34A363782
• Expansion of g^3/(1 - x^3*g), where g = 1+x*g^4 is the g.f. of A002293.at n=6A391103