31327

Properties

Appears in sequences

• a(n) = a(n-2) + a(n-5).at n=55A001687
• Numbers k such that 6!*(2*k-7)!/(k!*(k-1)!) is an integer.at n=34A004786
• Numbers k such that 7!*(2k-8)!/(k!*(k-1)!) is an integer.at n=38A004787
• Number of binary words of length n in which the ones occur only in blocks of length at least 4.at n=26A005253
• Primes that remain prime through 4 iterations of function f(x) = 9x + 4.at n=14A023325
• Denominators of continued fraction convergents to sqrt(465).at n=10A041887
• Denominators of continued fraction convergents to sqrt(880).at n=8A042701
• Primes p from A031924 such that A052180(primepi(p)) = 17.at n=31A052234
• Primes p equal to the sum of two successive sexy primes - 1 such that p - 6 is also prime.at n=34A104047
• Expansion of 1/(1-x^2*(1+x)^3).at n=18A116090
• a(1)=2, a(2)=3, a(3)=5; a(n) = largest prime < a(n-1)+a(n-2)+a(n-3).at n=17A126092
• Prime p3 of the sequence A164063: a^b - c^d = p1 (A164063), where a, b, c, d are primes and a + b + c + d = p2 (A164064), where p2 is prime and conc(abcd) = p3 (concatenation of a, b, c , d) is also prime.at n=3A164065
• a(n) = A151723(2^n).at n=7A169785
• Primes p such that 2*p^3 -+ 3 are also prime.at n=28A174363
• Primes of the form 9n^2 - 2.at n=12A201860
• Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the open interval (-n,n).at n=19A211032
• Primes or negative values of primes of the form 59*n^2 - 1873*n + 8941 for n>=0.at n=40A217604
• Prime p such that sqrt(p+2) is semiprime (A001358).at n=16A257933
• Primes p such that the sum of cubes of the 4 consecutive primes starting with p is twice a prime.at n=40A368637
• Number of compositions of 5*n-1 into parts 2 and 5.at n=10A369842