61553

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 70.at n=1A031658
• Primes p that have exactly three primitive roots that are not primitive roots mod p^2.at n=29A060519
• Primes p of the form a^4+b^4+c^4 with a,b,c>=1 such that a^2+b^2+c^2 is another prime < p.at n=42A126117
• Larger of 3 consecutive prime numbers such that p1*p2*p3*d1*d2=average of twin prime pairs; p1,p2,p3 consecutive prime numbers; d1(delta)=p2-p1, d2(delta)=p3-p2.at n=29A153411
• First primes of an arithmetic progression of six primes with common difference 30.at n=13A156204
• Prime factors in a divisibility sequence of the Lucas sequence v(P=3,Q=5) of the second kind.at n=25A164816
• Eighth prime p such that (p+n)^2+n is prime but (p+j)^2+j is not prime for all 0<j<n.at n=35A238680
• Primes p such that p - d and p + d are also primes, where d is the largest digit of p.at n=32A245877
• Prime numbersat n=6192