26321

Properties

Appears in sequences

• Quintan primes: p = (x^5 - y^5)/(x - y).at n=15A002649
• Expansion of 1/((1-5*x)*(1-11*x)).at n=4A016165
• Pisot sequence P(5,11), a(0)=5, a(1)=11, a(n+1) is the nearest integer to a(n)^2/a(n-1).at n=11A021008
• Primes p such that p*(p-2) divides 2^(p-1)-1.at n=12A081762
• Primes in which the unit place digit is 1 and the k-th most significant digit is prime (2,3,5,7) if k is prime else is composite (4,6,8,9,0).at n=36A089704
• Expansion of (1+x^2)^2/(1+x^2-2x^3+x^4+x^6).at n=34A099493
• Smaller pair of the primes described in A116074.at n=2A116075
• Primes p1 such that p1^2+p2^3=pp are average of twin primes. p1 and p2 consecutive primes, p1 < p2.at n=26A138715
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (-1, 0, 0), (1, -1, 1), (1, 1, 0)}.at n=9A149191
• Primes p such that (p+18), (p+36) and (p+72) are also prime.at n=30A175158
• Primes that are the sum of 51 consecutive primes.at n=18A215992
• Primes p such that p^2*q^2*r^2 + 12 and p^2*q^2*r^2 - 12 are primes where q and r are next two primes after p.at n=19A240725
• Numbers n such that (n^n-2)/(n-2) is an integer.at n=30A242787
• Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically.at n=7A258521
• Numbers n such that (n-1)^2-1 divides 2^(n-1)-1.at n=13A260406
• Primes equal to an octagonal number plus 1.at n=19A285792
• Prime numbers p such that 3*p - 2 is the square of a prime number.at n=20A289135
• Odd integers k such that 2^((k-1)/2) == 1 (mod k*(k-2)).at n=6A337846
• Primes q such that 15*q-4, 15*q-2, 15*q+2 and 15*q+4 are all primes.at n=12A342717
• Prime numbersat n=2893