1145257

Appears in sequences

• Overpseudoprimes to base 2: composite k such that k = A137576((k-1)/2).at n=26A141232
• Semiprime 2-pseudoprimes of the form 10k + 7.at n=27A216667
• Base-2 Fermat pseudoprimes k such that the multiplicative order of 2 modulo k is odd.at n=15A367230
• Composite numbers k such that 2^(2^(k-1)-1) == 1 (mod k^2).at n=8A376253
• Numbers that are partial sums of the reverses of the sequence of primes and are reverses of primes.at n=39A381245