126541

Properties

Appears in sequences

• 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 20.at n=33A031608
• Number of strings of numbers x(i=1..8) in 0..n with sum i*x(i)^2 equal to n*64.at n=9A184447
• Least prime p such that 2*prime(p*n)+1 = prime(q*n) for some prime q.at n=39A260882
• Primes p such that p+-2 and p+-4 are semiprimes.at n=27A266845
• Primes whose base-9 representation is a square in base 10.at n=26A267821
• Primes in Pi (variant of A336520): a(n) is the smallest prime factor of A090897(n) that does not appear in earlier terms of a, or 1, if no such factor exists.at n=17A336519
• Primes in Pi: a(n) is the smallest prime factor of A090897(n) that does not appear in earlier terms of A090897, or 1, if no such factor exists.at n=17A336520
• a(n) is the least number k whose digit sums are 2*n-1, 2*n and 2*n+1 in bases 2*n-1, 2*n and 2*n+1 respectively.at n=17A379896
• Prime numbersat n=11867