31649

Properties

Appears in sequences

• Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=4.at n=26A143447
• Primes that become squares when prefixed with a 4.at n=3A167737
• Primes p such that 2p+1, 3p+2 and 5p-2 are also primes.at n=25A178068
• Smallest emirp corresponding to A178585.at n=28A178586
• Primes that can be generated by the concatenation in base 7, in ascending order, of two consecutive integers read in base 10.at n=26A287308
• Coefficients in expansion of 1/(1 - x - 2*x^5).at n=30A318777
• G.f. A(x) satisfies 1 + 3*A(x) = Sum_{n>=0} (x + 2*A(x)^n)^n.at n=8A380062
• Prime numbersat n=3404