1293337

Appears in sequences

• Pseudoprimes whose prime factors do not divide any smaller pseudoprime.at n=28A084653
• Poulet numbers (2-pseudoprimes) of the form 144*n^2 + 222*n + 85.at n=16A214017
• Semiprime 2-pseudoprimes of the form 10k + 7.at n=29A216667
• Fermat pseudoprimes to base 2 that are decagonal.at n=23A321870
• a(n) is the smallest Fermat pseudoprime to base 2 such that gpf(p-1) = prime(n) for all prime factors p of a(n).at n=19A327789
• Fermat pseudoprimes to base 2 (A001567) k such that A003961(k) is also a Fermat pseudoprime to base 2.at n=2A346568