23561

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of function f(x) = 5x + 4.at n=33A023284
• Primes that are palindromic in base 5.at n=31A029973
• a(0) = 13; for n > 0, a(n) is the greatest prime factor of PreviousPrime(a(n-1))*a(n-1)-1 where PreviousPrime(prime(k))=prime(k-1).at n=4A031442
• a(n) is a cube mod a(i) for all i < n.at n=45A054762
• Primes p such that the number of distinct prime divisors of all composite numbers between p and the next prime is 5.at n=38A075585
• Primes p of the form k*(k + 1) - 1 such that p and p + 2 are twin primes.at n=20A088486
• Successive record-setters for tau(n+1)*tau(n-1)/tau(n)^2, where tau(n) is the number of divisors of n.at n=23A094342
• Primes that are a concatenation of 2, 3, 5 and a prime.at n=3A101251
• Primes p equal to the sum of two successive sexy primes + 1 such that p + 6 is also prime.at n=31A104043
• Total number of parts in the tails below the Durfee squares of all partitions of n.at n=27A114089
• Start with the empty list; for k = 1..oo, append to the list the smallest prime of the form k*m^3+m+1 with m>0 if such a prime exists, otherwise skip this value of k.at n=43A114365
• Primes in A128490.at n=23A128491
• Primes p such that p^3 +- (p+1) are primes.at n=26A137472
• Lesser of twin primes p1 such that p1+(p2^2-p1^2) and p2+(p2^2-p1^2) are prime numbers.at n=30A174922
• Shiraishi numbers: a parametrized family of solutions c to the Diophantine equation a^3 + b^3 + c^3 = d^3 with d = c+1.at n=26A226903
• Primes p such that f(f(p)) is prime, where f(x) = x^4 + x^3 + x^2 + x + 1 = A053699(x).at n=25A237445
• Lesser of consecutive primes whose average is an oblong number.at n=38A242383
• Non-palindromic balanced primes in base 16.at n=27A256090
• Subtract 1 from the terms of A256407.at n=40A256410
• Twin prime pairs of the form (k^2 + k - 1, k^2 + k + 1).at n=40A265006