127750

Appears in sequences

• Pentagonal numbers (A000326) whose digit reversal is a brilliant number (A078972).at n=17A115680
• Pentagonal numbers for which the sum of the digits is also a pentagonal number.at n=30A117709
• Pentagonal numbers for which both the sum of the digits and the product of the digits are pentagonal numbers.at n=18A117711
• G.f. A(x) satisfies A(A(x)) = Sum_{k>=1} k^2 * 2^(k-1) * x^k.at n=9A372493