18303
domain: N
Appears in sequences
- Powers of cube root of 19 rounded to nearest integer.at n=10A018031
- Powers of cube root of 19 rounded up.at n=10A018032
- 2*3*5*6*...*a(n) -+ 1 are primes, with a(n+1) > a(n).at n=42A087900
- Numbers k such that 6*10^k-11 is prime.at n=17A102739
- Numbers k such that k + sigma(k) + sigma(sigma(k)) is a repdigit.at n=10A116028
- Number A(n,k) of 3n-length k-ary words that can be built by repeatedly inserting triples of identical letters into the initially empty word; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=41A213028
- Numbers k such that (22*10^k - 19)/3 is prime.at n=22A282139
- G.f. A(x) satisfies: A(x) = 1 + Sum_{k>=1} k*x^k*A(x)^k/(1 - x^k).at n=8A307398
- a(n) = (A230624(n)-2)/4.at n=49A350607