191819

Appears in sequences

• a(n) = (12*n+1)*(12*n+11).at n=36A001538
• a(n) = Sum_{k=1..n} Sum_{j=1..k} (prime(k) - prime(j))^2.at n=19A062022
• a(n) = floor(((1+sqrt(3))/2)^n).at n=38A125895
• Quasi-Carmichael numbers to exactly three bases.at n=34A257753
• Numerator of variance of first n primes.at n=19A301275