31601

Properties

Appears in sequences

• Related to Gilbreath conjecture.at n=31A001549
• a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = A001950 (upper Wythoff sequence).at n=36A024689
• 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 14.at n=18A031602
• a(n) = prime(100*n).at n=33A031921
• Primes p such that number of primes produced according to rules stipulated in Honaker's A048853 is 3.at n=27A050665
• Numbers k such that sigma(phi(sigma(k))) = phi(sigma(phi(k))).at n=18A067160
• Primes of the form 5k^2 + 5k + 1.at n=40A090562
• Father primes of order 11.at n=31A136080
• Partial sums of A065641.at n=16A174202
• Primes of the form 5*p^2+5*p+1, where p is a prime.at n=12A225874
• Number of length 3+1 0..n arrays with the sum of the maximum of each adjacent pair multiplied by some arrangement of +-1 equal to zero.at n=39A250647
• Primes of form n^2 + 625.at n=32A256777
• Number of nonnegative integers k with n digits such that x^2 - s*x + p has only integer roots, where s and p denote the sum and product of the digits of k respectively.at n=4A355574
• Prime numbersat n=3400