30433

Appears in sequences

• Numbers n such that n is a substring of its square in base 3 (written in base 10).at n=30A018827
• Numbers n such that n is a substring of its square in base 9 (written in base 10).at n=11A018833
• G.f. satisfies: A(x*A(x)) = G(x) where G(x) = 1 + x*G(x)^3 is the g.f. of A001764.at n=9A168653
• Odd composite numbers m for which A000111(m) == (-1)^( (m-1)/2 ) (mod m).at n=14A180942
• Numbers k such that (2^k + k - 1)*2^k + 1 is prime.at n=8A201358
• A digitized pure tuning tone, sampled at standard settings for consumer audio: a(n) = floor(sin(2*Pi*(440/44100)*n)*32767).at n=19A320277
• Numbers k such that the k-th triangular number mod the sum (with multiplicity) of prime factors of k, and the k-th triangular number mod the sum of divisors of k, are the same prime.at n=2A353002
• a(n) = [x^n] Product_{k=1..n} (x^(k^4) + 1/x^(k^4)).at n=36A368206
• a(n) is the sum of all numbers k such that the greatest prime factor of k^2 - 1 is prime(n).at n=4A379344
• Expansion of 1 / ((1-x)^5 - x^4)^2.at n=8A392589