130501

Appears in sequences

• Sum of digits of numbers between 0 and (7/9)*(10^n-1).at n=4A089908
• 10-gonal numbers for which the sum of the digits is also a 10-gonal number.at n=23A119547
• Numbers k such that k and k^2 use only the digits 0, 1, 3, 5 and 7.at n=7A136844
• a(n) = n! * [x^n] exp((1 - 2*x)/(1 - 3*x + x^2) - 1).at n=6A188365
• 10-gonal (or decagonal) numbers with prime indices.at n=41A267217