23981

Properties

Appears in sequences

• Primes of the form j^2 + (j+1)^2.at n=38A027862
• Primes of the form (4*k + 1)^2 + (4*k + 2)^2 where k=0,1,2,3,...at n=10A087871
• Centered square numbers that are prime powers of the form (4n+1)^k.at n=40A133322
• Primes p such that q*p+-Mod(p,q) are primes, for q=7.at n=33A178387
• Number of self-inverse permutations p on [n] with displacement of elements restricted by 5: |p(i)-i| <= 5.at n=12A239077
• Lesser of consecutive primes whose sum is a palindromic number.at n=31A242386
• Self-convolution square-root of A243950, which is the sums of the squares of the q-binomial coefficients for q=2 in rows of triangle A022166.at n=5A243951
• Primes of the form 2*n^2+86*n+41.at n=31A243958
• Primes whose anti-divisors sum to a prime.at n=16A259932
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 918", based on the 5-celled von Neumann neighborhood.at n=36A273748
• Row sums of irregular triangle A292224. a(n) gives the total number of admissible tuples starting with 0 in the interval [0, 1, ..., n-1].at n=46A292225
• Row sums of irregular triangle A292224. a(n) gives the total number of admissible tuples starting with 0 in the interval [0, 1, ..., n-1].at n=47A292225
• Least prime p such that p minus the multiplication of its digits is the n-th prime before p.at n=48A321570
• Successive approximations up to 2^n for the 2-adic integer 17^(1/4). This is the 1 (mod 4) case.at n=13A341751
• Successive approximations up to 2^n for the 2-adic integer 17^(1/4). This is the 1 (mod 4) case.at n=14A341751
• Successive approximations up to 2^n for the 2-adic integer 17^(1/4). This is the 1 (mod 4) case.at n=15A341751
• Table read by rows: row n is the unique primitive Pythagorean triple (a,b,c) such that (a-b+c)/2 = A002378(n) and its long leg and hypotenuse are consecutive natural numbers.at n=29A385022
• Primes p such that 2p-1 is a square and 2p+1 is also prime.at n=6A386995
• Prime numbersat n=2667