52009

Properties

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 91.at n=0A031679
• Numbers n such that n*(n-1) is an oblong (promic, A002378) palindrome.at n=10A056794
• Primes of the form 16*m^2 + 25, m=1,3,5,...at n=12A087856
• Primes of the form 16*m^2 + 25 for m=1,2,3,...at n=21A087857
• Numbers k such that k times phi(k) is a palindrome.at n=20A115891
• Primes containing the digits (2,0,0,9) in that order.at n=1A197114
• Least prime p such that 2*prime(p*n)+1 = prime(q*n) for some prime q.at n=20A260882
• Primes equal to an octagonal number plus 1.at n=24A285792
• Primes that yield squares after deletion of their zero digits.at n=21A321151
• Primes of the form k^2 + 25.at n=47A346145
• Primes having only {0, 2, 5, 9} as digits.at n=37A386050
• Prime numbersat n=5320