31439

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 39 ones.at n=5A031807
• Brilliant numbers k such that 2k+1 is also brilliant.at n=16A085649
• Numbers n such that n and its reversal are distinct brilliant numbers (A078972).at n=33A097435
• Indices of primes in sequence defined by A(0) = 83, A(n) = 10*A(n-1) + 63 for n > 0.at n=23A101079
• Indices of primes in the sequence defined by A(0) = 29, A(n) = 10*A(n-1) - 21 for n > 0.at n=20A101965
• Number of compositions of n in which the greatest part is even.at n=16A103422
• Expansion of g.f.: (1-2*x-sqrt(1-4*x+8*x^3-4*x^4))/(2*x^2*(1-x)).at n=11A135052
• Numbers n such that the digits of sigma(n) are exactly the same (albeit in different order) as the digits of phi(n), in base 10.at n=35A175795
• Number of (n+4) X 9 0..1 matrices with each 5 X 5 subblock idempotent.at n=15A224687
• Number of length n 0..3 arrays with new values introduced in order from both ends.at n=11A245158