220729
domain: N
Appears in sequences
- Strong pseudoprimes to base 2.at n=19A001262
- Overpseudoprimes to base 2: composite k such that k = A137576((k-1)/2).at n=10A141232
- Fermat pseudoprimes that are not Carmichael numbers and have only composite XOR couples as defined in A182108.at n=4A252944
- Base-2 Fermat pseudoprimes k such that the multiplicative order of 2 modulo k is odd.at n=6A367230
- Expansion of Product_{k>=0} 1 / (1 - x^(3^k))^3.at n=42A374627
- Composite numbers k such that 2^(2^(k-1)-1) == 1 (mod k^2).at n=4A376253