21980

Appears in sequences

• a(n) = n OR n^3 (applied to binary expansions).at n=27A008468
• a(n) = n^3 + n.at n=28A034262
• a(n) = n*(n^2 + 1) if n is even, otherwise (n - 1/2)*(n^2 + 1).at n=28A071289
• a(n) = A078343(n) + (-1)^n.at n=12A111955
• a(n) = 1000*n - 20.at n=21A157515
• a(n) = 2*n*(9*n-1).at n=34A178574
• a(n) = n + [n^2 if n is odd or n^3 if n is even].at n=27A181427
• Numbers k such that prime(k) + 1, ..., prime(k + 5) + 1 have the same number of prime divisors (with multiplicity).at n=8A255193
• a(n) = n XOR n^3.at n=28A261807
• 2nd-order coefficients of the 1/N-expansion of traces of negative powers of complex Wishart matrices with parameter c=2.at n=6A277660
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S)^5.at n=10A291225
• a(n) = Sum_{k=1..n} phi(gcd(k, n))^3.at n=28A342535