23831

Properties

Appears in sequences

• Discriminants of quintic fields with 2 complex conjugates (negated).at n=47A023684
• Primes p such that p+1 is palindromic.at n=39A028981
• Initial terms of '4-block' primes as described in A032591.at n=35A032592
• Sum of composite numbers between prime p and nextprime(p) is palindromic.at n=23A054266
• Row sums of array T as in A055215.at n=32A054405
• Primes which are the concatenation of numbers n_1, n_2, n_3, in that order, with n_1 + n_2 = n_3 (leading zeros are forbidden for nonzero n_i).at n=39A067860
• Largest prime factor of 2^n-3.at n=16A093817
• Prime numbers p of the form p=x^2+y^3 such that there exist three other prime numbers q,r,s such q=abs(x^2-y^3) ; r=x^3+y^2 ; s=abs(x^3-y^2); x > y.at n=10A129537
• Lesser of Twin prime numbers of the form : i^2+j^3, as sum of square and cube, if Greater Twin prime number also of the form : i^2+j^3, as sum of square and cube.at n=6A143799
• Primes that are the sum of all composite numbers in-between prime numbers p(n) and p(n+2).at n=22A174521
• Primes p with property that there exists a number d>0 such that numbers p-k*d, k=1...7, are seven primes.at n=32A216590
• Lesser of consecutive primes whose average is a palindromic number.at n=36A242387
• a(n+1) is the smallest prime beyond a(n) such that a(n+1) modulo a(n) is (congruent to) a prime; start with a(0)=1.at n=18A248370
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 177", based on the 5-celled von Neumann neighborhood.at n=17A279603
• Primes p such that p+2, (p+1)||p and (p+1)||(p+2) are primes (where || denotes concatenation in base 10).at n=30A309934
• Primes p such that the sum of A001414(k) for k strictly between p and the following prime is a proper prime power (a term of A246547).at n=46A343123
• Prime numbersat n=2651