140743

Appears in sequences

• Numbers k such that 10*3^k - 1 is prime.at n=50A005542
• Fourth step in Goodstein sequences, i.e., g(6) if g(2)=n: write g(5)=A059934(n) in hereditary representation base 5, bump to base 6, then subtract 1 to produce g(6).at n=6A059935
• Indices of primes in sequence defined by A(0) = 43, A(n) = 10*A(n-1) + 63 for n > 0.at n=18A101739
• Triangular matrix, read by rows, equal to the matrix logarithm of triangle A105623.at n=38A105629
• a(n) = G_n(9), where G is the Goodstein function defined in A266201.at n=4A271556