23531

Properties

Appears in sequences

• Number of partitions of at most n into at most 5 parts.at n=43A002622
• Numbers k such that 6!*(2*k-7)!/(k!*(k-1)!) is an integer.at n=25A004786
• Numbers k such that 7!*(2k-8)!/(k!*(k-1)!) is an integer.at n=28A004787
• Primes p such that p+1 is palindromic.at n=38A028981
• Numerators of continued fraction convergents to sqrt(987).at n=4A042910
• Primes that are a concatenation of 2, 3, 5 and a prime.at n=1A101251
• Primes p such that 5*p - 6 is square.at n=17A110482
• Primes p of Erdos-Selfridge class 4+ with largest prime factor of p+1 not of class 3+.at n=18A129472
• Primes p such that (p+18), (p+36) and (p+72) are also prime.at n=27A175158
• a(n) = smallest prime > a(n-1) such that a(n)+a(n-1) is multiple of k, a(1)=2, k=101.at n=35A178468
• There appear to be at least n primes in the range (x-sqrt(x), x] for all x >= a(n).at n=8A189026
• Number of partitions of n such that the number of parts is not divisible by the greatest part.at n=37A200727
• Number of partitions of n such that the number of odd parts is a part.at n=44A240574
• a(n+1) is the smallest prime > a(n) such that the digits of a(n) are all (with multiplicity) contained in the digits of a(n+1), with a(1)=5.at n=8A242906
• a(n) is the smallest prime in the interval [k*sqrt(k), k*sqrt(k+2)], where k = A001359(n), or a(n)=0 if there is no prime in this interval.at n=31A247867
• Number of equivalence classes of ballot paths of length n for the string dud.at n=25A274113
• a(n) is the smallest x > 2 to satisfy pi(x-1)/(x-1)^n < pi(x)/x^n, where pi(x) is the prime counting function (A000720).at n=8A293010
• Number of fully chiral integer partitions of n.at n=39A330228
• a(n) = (p-1)! mod p^3, where p = prime(n).at n=11A330526
• Prime numbers preceded by two consecutive numbers which are products of four distinct primes (or tetraprimes).at n=6A361796