34759

Properties

Appears in sequences

• a(n) is the smallest prime m such that prod(m) = n*length(m)*sum(m) where prod(m) is the product of the digits of m, length(m) is the number of digits of m, sum(m) is the sum of the digits of m; or 0 if no such m exists.at n=26A064023
• Largest eigenvalue, rounded to the nearest integer, of a rank n matrix of 1..n^2 filled successively along rows.at n=40A072333
• Least prime p such that pi(p*n) = prime(q*n) for some prime q, where pi(x) denotes the number of primes not exceeding x.at n=36A260197
• Primes p that remain prime through 3 iterations of function f(x) = 6x - 1.at n=32A289109
• Primes in A338529/2.at n=19A338533
• a(n) = Sum_{k=1..n} (-1)^(k+1) * floor(n/(2*k-1))^3.at n=32A350163
• a(n) = Sum_{k=1..n} binomial(floor(n/k)+3,4).at n=27A365409
• Numbers k such that (20^k + 3^k)/23 is prime.at n=8A379986
• Prime numbersat n=3713