28097

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of function f(x) = 2x + 3.at n=36A023273
• Indices of primes in the sequence defined by A(0) = 51, A(n) = 10*A(n-1) + 71 for n > 0.at n=12A101587
• Primes of the form 10 * k^2 + 7.at n=25A195905
• Expansion of phi(x^2) / f(-x) in powers of x where phi(), f() are Ramanujan theta functions.at n=33A226622
• Primes p with p + 2, prime(p) + 2 and prime(prime(p)) + 2 all prime.at n=7A236481
• a(n) = prime(k) with k = n^2 + prime(n)^2.at n=15A243892
• Primes p such that p^3 is the concatenation of two k-digit primes where k is half the number of decimal digits in p^3.at n=10A248208
• Primes of form n^2 + 14641.at n=13A256839
• Primes p(n) such that p(n) + p(n+3) = p(n+1) + p(n+2) and p(n) + p(n+4) = p(n+2) + p(n+3).at n=21A266882
• Primes 10k + 7 preceding the maximal gaps in A269238.at n=7A269239
• Primes of the form 25*n^2 + 25*n + 47.at n=25A281437
• Numbers m that divide A177754(m) = Sum_{k=1..m} uphi(k), where uphi is the unitary totient function (A047994).at n=17A306950
• Smallest k such that in the pairs of numbers j*k +- 1, none is prime for 1 <= j < n but at least one is prime for j = n; or 0 if no such k exists.at n=37A348347
• Prime numbersat n=3065