23227

Properties

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 80 ones.at n=26A031848
• Number of positive integers <= 2^n of form 5 x^2 + 7 y^2.at n=18A054177
• Take A000040, omit commas: 23571113171923..., select 5-digit primes seen when scanning from left.at n=23A073038
• Number of polyominoes with n cells that tile the plane isohedrally.at n=11A075205
• Primes p such that q-p = 24, where q is the next prime after p.at n=37A098974
• Primes that are a concatenation of 2, 3 and a prime.at n=11A101218
• Prime(144*n).at n=17A102350
• Primes p such that 2*p +/- 3 and 8*p +/- 3 are all primes.at n=13A106022
• Primes with prime number of only prime digits (i.e., 2, 3, 5, 7).at n=24A124888
• Prime numbers, isolated from neighboring primes by >16.at n=26A137875
• Primes p such that none of p-2, p-1, p+1, and p+2 is squarefree.at n=10A153215
• Primes p of the form : p+p^2+p^3-+8=prime.at n=22A154823
• a(n) = 13*n^2 + 7*n + 1.at n=41A168240
• Primes p such that q*p +- (p mod q) are primes, for q=8.at n=26A178416
• Primes that are the average of the members of emirp pairs.at n=15A178581
• Nonpalindromic primes that are the average of the members of emirp pairs.at n=7A178585
• Primes of the form 3*m^2 - 5.at n=16A201717
• Primes that contain only the digits (2, 3, 7).at n=32A214704
• a(n) = number of new distinct proper angles with vertex and legs on grid points in an n X n square grid that were not found in an (n-1) X (n-1) square grid.at n=34A252592
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-2) + n - 1, where a(0) = 1, a(1) = 2, b(0) = 3.at n=17A294539