121465
domain: N
Appears in sequences
- Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 36.at n=13A031624
- Fermat pseudoprimes to base 2 with three prime factors.at n=36A215672
- Fermat pseudoprimes to base 2 divisible by 5.at n=17A216023
- Composite integers k such that 2^k == 2 (mod k*(k+1)).at n=22A217465
- Fermat pseudoprimes to base 2 which are not Euler pseudoprimes to base 2.at n=36A227136