18203

Appears in sequences

• Spiral sieve using Fibonacci numbers.at n=20A005624
• Numbers k such that sigma(k) = sigma(k+6).at n=36A015866
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 19 ones.at n=13A031787
• Initial pile sizes that guarantee a win for player 2 in a variant of Fibonacci Nim where the players may not take one stone.at n=41A052492
• The number of possible values of the squarefree kernel (A007947) shared by at least two solutions x to A056239(x) = n.at n=51A088318
• Numbers n such that n and its reversal are distinct brilliant numbers (A078972).at n=27A097435
• a(n) is least number k >= 3 such that (k^(2^n) + (k-2)^(2^n))/2 is prime.at n=15A302387
• Number of partitions of n containing a prime number of distinct primes and an arbitrary number of nonprimes.at n=38A344715