390937
domain: N
Appears in sequences
- Strong pseudoprimes to base 2.at n=28A001262
- Overpseudoprimes to base 2: composite k such that k = A137576((k-1)/2).at n=14A141232
- a(n) is the least base-2 overpseudoprime k such that the multiplicative order of 2 mod k equals 8*n+20.at n=16A141629
- Poulet numbers of the form (6k+1)*(24k+1).at n=3A182123
- Semiprime 2-pseudoprimes of the form 10k + 7.at n=14A216667
- Composite integers k such that 2^k == 2 (mod k*(k+1)).at n=38A217465
- Pseudoprimes congruent to 7 mod 10.at n=17A317972
- Fermat pseudoprimes to base 2 that are decagonal.at n=14A321870