23911

Properties

Appears in sequences

• Denominators of continued fraction convergents to sqrt(837).at n=6A042617
• Numbers p from A001125 such that 2*p-3 is prime.at n=30A063939
• Let p = n-th prime, then a(n) = smallest prime having p as its least prime primitive root.at n=20A084739
• Primes arising in A088084.at n=3A088085
• Primes arising in A088086.at n=3A088087
• Primes that are a concatenation of 2, 3 and a prime.at n=30A101218
• Larger prime in pair prime(k) +/- k for some k.at n=30A107637
• Primes arising in A110772.at n=3A110773
• Home primes whose homeliness is 4.at n=31A133962
• Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 0010-1110-0111-0100 pattern in any orientation.at n=14A146904
• Number of compositions of n such that the greatest part is divisible by the number of parts.at n=20A171632
• Numbers n such that Sum_{i=1..n} (i')^i == 0 (mod n), where i' is the arithmetic derivative of i.at n=12A227848
• Primes which are the concatenation of two primes in exactly three ways.at n=5A238499
• Primes that can be generated by the concatenation in base 3, in descending order, of two consecutive integers read in base 10.at n=29A287301
• Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.at n=6A297900
• Number of n X 7 0..1 arrays with every element equal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.at n=6A297906
• Numbers k such that 2^k + 5*k is a prime.at n=21A299642
• a(n) is the start of the first maximal string of n consecutive primes such that the sum of squares of pairs of consecutive primes in the string is always divisible by 10.at n=14A346215
• Prime numbersat n=2661