26173

Appears in sequences

• Sequences of B-trees of order 3 with n labeled leaves.at n=15A058520
• Numbers n such that n and prime(n) end with the same three digits.at n=22A067841
• Triangle read by rows in which row n >= 1 gives coefficients in expansion of the polynomial Sum_{k=1..n} (1/n)*binomial(n,k)*binomial(n,k-1)*x^(2k)*(1+x)^(2n-2k) / x^2 in powers of x.at n=55A086873
• Numbers with d digits (d>0) which have at least 2d distinct primes as substrings.at n=28A168167
• Expansion of 1/(1 - x - x^8 - x^15 + x^16).at n=52A173925