19013

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 61.at n=29A020400
• Primes of the form j^2 + (j+1)^2.at n=33A027862
• Primes p such that the decimal digits of p^2 can be partitioned into two or more nonzero squares.at n=34A048646
• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 21.at n=23A051962
• Smaller of two consecutive primes which are anagrams of each other.at n=2A069567
• List of Ormiston prime pairs.at n=4A072274
• a(n) = sqrt(A076967(n)).at n=27A076968
• Primes of the form (4*k + 1)^2 + (4*k + 2)^2 where k=0,1,2,3,...at n=9A087871
• Smallest prime of the form (prime(n)*prime(n+1)+q)/2 for some integer n and some prime q.at n=42A100557
• Nontrivial Delannoy numbers that are primes.at n=35A101167
• Primes of the form 14k+1 generated recursively. Initial prime is 29. General term is a(n)=Min {p is prime; p divides (R^7 - 1)/(R - 1); Mod[p,7]=1}, where Q is the product of previous terms in the sequence and R = 7Q.at n=11A124992
• Floor( 2*(2*n+1)^n*sinh(1/2) ) - (2*n+2)^n + (2*n)^n.at n=5A127695
• Centered square numbers that are prime powers of the form (4n+1)^k.at n=35A133322
• Triangle T(n,k) read by rows: number of k X k symmetric matrices with nonnegative integer entries and without zero rows or columns such that sum of all entries is equal to n, n>=1, 1<=k<=n.at n=49A138177
• Primes congruent to 15 mod 59.at n=34A142742
• Primes congruent to 42 mod 61.at n=32A142840
• Smaller prime p in Ormiston pairs (p, q) with q - p = 18.at n=2A163678
• Duplicate of A163678.at n=2A175517
• Cyclops emirps.at n=29A183057
• Number of strings of n numbers x(i) in -3..3 with sums of x(i) and of x(i)*x(i+1) both zero.at n=7A183938