26237

Properties

Appears in sequences

• Primes of the form k^2 - 7.at n=16A028883
• Numbers k such that 171*2^k-1 is prime.at n=34A050837
• Primes p such that p+7 == 0 (mod phi(p+7)).at n=29A067606
• Numerators of continued fraction convergents to cosh(1).at n=10A078983
• Expansion of 1/(1 - x^3 - x^4 + x^7 - x^10 - x^11 + x^14) (a Salem polynomial).at n=63A143644
• Middle of 3 consecutive prime numbers, p1, p2, p3, such that p1*p2*p3*d1*d2 = average of twin prime pairs; d1 (delta) = p2 - p1, d2 (delta) = p3 - p2.at n=21A153410
• Primes of the form 3*n^2 - 3*n + 11.at n=42A153502
• Prime factors in a divisibility sequence of the Lucas sequence v(P=3,Q=5) of the second kind.at n=13A164816
• Primes of the form k*(k+1)*(k+2)/6+2 (i.e., two more than a tetrahedral number).at n=10A221055
• Primes p with A047967(p) also prime.at n=19A236418
• The first position of the first cycle of sequence {b_k}={b_k}(n) in A237671.at n=18A238019
• Lesser of consecutive primes whose average is of the form k*(k+2), for some integer k.at n=29A242385
• Number of integer partitions of n into relatively prime parts that are all greater than 1.at n=48A302698
• a(n) is the (conjectured) largest number k that is zeroless in every base b such that n <= b < k.at n=2A319033
• Primes p such that (q*s-p*r)/2 and |p*s-q*r|/2 are both prime, where p,q,r,s are consecutive primes.at n=30A341802
• Prime numbersat n=2883