28469

Appears in sequences

• Starting index of a string of 4 or more consecutive equal digits in decimal expansion of Pi.at n=25A049516
• Coefficients in the series (1 + x^2 + x^3 + x^5 + x^7 + x^11 + x^13 + ... )/(1 - x - x^4 - x^6 - x^8 - x^9 - x^10 - x^12 - x^14 - ... ).at n=25A058355
• Starting positions of strings of three 3's in the decimal expansion of Pi.at n=18A083610
• Number of binary trees of path length n.at n=34A095830
• Matrix log of triangle A111830, which shifts columns left and up under matrix 7th power; these terms are the result of multiplying each element in row n and column k by (n-k)!.at n=24A111833
• Numbers k such that (5*10^k + 91) / 3 is prime.at n=23A275020