27054

Appears in sequences

• a(n) = (7*n+1)*(7*n+6).at n=23A001526
• a(n) = prime(n)*prime(n+1) - prime(n+1).at n=37A037167
• a(n) = (5*n+2)*(5*n+7).at n=32A085036
• Antidiagonal sums of A086272 (and of A086273).at n=26A086274
• Numbers k such that (3*2^k - 1)^2 - 2 is prime.at n=15A100911
• Expansion of Product_{k>=1} 1/(1-x^(3*k-1))^(3*k-1).at n=32A262946
• Numbers k such that (35*10^k - 11)/3 is prime.at n=32A268448
• Numbers k such that (73*10^k + 107)/9 is prime.at n=23A275525
• Expansion of Product_{1 <= i_1 <= i_2 <= i_3 <= i_4} (1 + x^(i_1*i_2*i_3*i_4)).at n=42A321567
• a(n) = Sum_{k=0..n} Sum_{j=0..n-k} binomial(j+k, k)*|Stirling1(n, j+k)|*(k+1)^j.at n=6A325138
• Primitive practical numbers of the form 2 * 3^i * prime(k).at n=36A367481
• a(n) = n * A033885(A003961(n)), where A033885(n) = 3*n-sigma(n), and A003961 is fully multiplicative with a(p) = nextprime(p).at n=53A388977