112897

Appears in sequences

• Strong pseudoprimes to base 89.at n=36A020315
• Nonprime numbers n such that phi(n) divides n^2 - 1, where phi(n) (A000010) is Euler's totient function.at n=26A098271
• Triangle read by rows: T(n,k) = 1 + (A022168(n,k) - binomial(n,k))^2.at n=16A174921
• Triangle read by rows: T(n,k) = 1 + (A022168(n,k) - binomial(n,k))^2.at n=19A174921
• a(n) is the number m such that f(sqrt(n)) is in the field Q(sqrt(m)), where f(x) is defined from the continued fraction x = [c(0), c(1), ... ] as [c(0) + 1, c(1) + 1, ...].at n=28A229957