30694

Appears in sequences

• Meandric numbers: number of ways a river can cross a road n times.at n=14A005316
• Number of meanders in which first bridge is 3.at n=13A006660
• Numbers k such that k | sigma_6(k) + phi(k)^6.at n=18A055700
• Meandric numbers for a river crossing two parallel roads at n points.at n=13A076876
• Number of ways a river can cross a road 2n times.at n=7A077054
• Numbers k such that 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*(k+5)*p(k+6)-1 and 6*p(k)*p(k+1)*p(k+2)*p(k+3)*p(k+4)*(k+5)*p(k+6)+1 are twin primes with p(h) = h-th prime.at n=17A129313
• Irregular triangle read by rows: T(n,k) = number of meanders with n bridges in which the first bridge is bridge k.at n=56A259974
• Irregular triangle read by rows: T(n,k) = number of meanders with n bridges in which the first bridge is bridge k.at n=63A259974
• Irregular triangle read by rows: T(n,k) = number of meanders with n bridges in which the first bridge is bridge k.at n=65A259974
• Irregular triangle read by rows: T(n,k) = number of meanders with n bridges in which the first bridge is bridge k.at n=71A259974