Decomposition of A050805
Inserting any digit between adjacent digits of prime p never yields another prime.
Decomposition of A050813
Numbers n not palindromic in any base b, 2 <= b <= 10.
Decomposition of A050931
Solutions c of cot(2*Pi/3)*(-(a+b+c)*(-a+b+c)*(-a+b-c)*(a+b-c))^(1/2)=a^2+b^2-c^2, c>a,b integers.
Decomposition of A050936
Sum of two or more consecutive prime numbers.
Decomposition of A051004
Numbers divisible both by their individual digits and by the sum of their digits.
Decomposition of A051146
Sequence b(n) mentioned in A051145.
Decomposition of A051283
Numbers n such that if write n = Product p_i^e_i (p_i primes) and P = max p_i^e_i, then n/P > P.
Decomposition of A051507
Primes p such that p*q+2 is prime, where q is next prime after p.
Decomposition of Strong primes
Strong primes: prime(n) > (prime(n-1) + prime(n+1))/2.
Decomposition of Weak primes
Weak primes: prime(n) < (prime(n-1) + prime(n+1))/2.