131880

Appears in sequences

• Coordination sequence for 4-dimensional primitive di-isohexagonal orthogonal lattice.at n=28A008530
• Octagonal numbers for which the sum of the digits is also an octagonal number.at n=18A117082
• Octagonal numbers for which both the sum and the product of the digits is also an octagonal number.at n=8A117084
• a(n) = smallest k such that prime(n) is the n-th largest divisor of k.at n=36A226326