42797

Properties

Appears in sequences

• Fibonacci sequence beginning 2 9.at n=19A022114
• 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 21.at n=15A031609
• Numbers which are primes and which remain prime for three successive applications of incrementing each digit by 2 with carries ignored.at n=35A088787
• Chen primes p such that their p + 2 counterpart is a Sarrus number (pseudoprime to base 2).at n=7A109994
• Primes occurring in A084704 exactly 4 times.at n=22A128655
• Lesser prime factor of successively better golden semiprimes.at n=15A165571
• Lesser of pseudo twin primes to base 2.at n=27A192297
• The Riemann primes of the psi type and index 1.at n=42A197185
• Intersection of A251964, A252280 and A252281.at n=43A252283
• Denominator of lower primes-only best approximates (POBAs) to the golden ratio, phi (A001622); see Comments.at n=12A265797
• Denominators of primes-only best approximates (POBAs) to the golden ratio, phi; see Comments.at n=16A265801
• Numerators of primes-only best approximates (POBAs) to 1/(golden ratio) = 1/phi; see Comments.at n=15A265806
• Prime numbersat n=4476