139231
domain: N
Appears in sequences
- Strong pseudoprimes to base 10.at n=20A020236
- Strong pseudoprimes to base 11.at n=30A020237
- Strong pseudoprimes to base 78.at n=33A020304
- Denominators of continued fraction convergents to sqrt(775).at n=10A042495
- Nonprime numbers n such that phi(n) divides n^2 - 1, where phi(n) (A000010) is Euler's totient function.at n=28A098271