131289

Appears in sequences

• Triangle T(n, k, q) = binomial(n, k) + q^n*binomial(n-2, k-1) - 1 with T(n, 0) = T(n, n) = 1 and q = 3, read by rows.at n=40A173047
• Odd numbers divisible by 3 which are neither of the form p + 3^m + 1 nor of the form p + 3^m - 1 with p prime.at n=27A282191