160230

Appears in sequences

• Numbers n such that sopf(n) = sopf(n-1) - sopf(n-2), where sopf(x) = sum of the distinct prime factors of x.at n=18A076527
• Pentagonal numbers for which the sum of the digits is also a pentagonal number.at n=33A117709
• Pentagonal numbers for which both the sum of the digits and the product of the digits are pentagonal numbers.at n=19A117711