81097

Properties

Appears in sequences

• Number of stable towers of 2 X 2 LEGO blocks.at n=11A007575
• Primes that remain prime through 4 iterations of function f(x) = 5*x + 6.at n=17A023315
• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 27.at n=13A031615
• Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 7 (most significant digit on right).at n=12A061960
• Primes from merging of 5 successive digits in decimal expansion of Pi.at n=16A104825
• Primes obtained from other primes by prefixing an 8.at n=43A290407
• Prime numbersat n=7939