22619

Properties

Appears in sequences

• Smallest prime p==3 (mod 8) such that Q(sqrt(-p)) has class number 2n+1.at n=26A002148
• Quadruples of different integers from [ 1,n ] with no global factor.at n=28A015622
• Prime number spiral (clockwise, South spoke).at n=25A054566
• Primes p such that the number of distinct prime divisors of all composite numbers between p and the next prime is 5.at n=36A075585
• Numerator of coefficients of power series for exp(exp(x)-1).at n=11A076903
• Near twin primes of order 18: twin primes (p, p+2) such that p+18 and p+20 are primes.at n=32A079304
• Primes from merging of 5 successive digits in decimal expansion of Catalan's constant.at n=9A104919
• Positive integers i for which A112049(i) == 8.at n=26A112068
• Numbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 9.at n=25A137006
• Primes of the form 41+(n+n^2)/2=41+A000217(n).at n=27A139219
• Primes congruent to 49 mod 61.at n=36A142847
• Largest prime factor of n-th Bell number A000110(n) (or 1 if A000110(n) = 1).at n=11A144293
• Lesser of twin primes of the form k^1 + k^2 + k^3 + k^4 - 1.at n=2A156026
• Primes of the form k^4 + k^3 + k^2 + k - 1.at n=5A182385
• Number of n X n symmetric binary matrices with each 1 adjacent to no more than 5 king-move neighboring 1s.at n=4A191481
• Primes p such that p+2 and q are primes, where q is concatenation of binary representations of p and p+2: q = p * 2^L + p+2, where L is the length of binary representation of p+2: L=A070939(p+2).at n=29A232238
• Least prime divisor of B(n) which does not divide any B(k) with k < n, or 1 if such a primitive prime divisor of B(n) does not exist, where B(n) is the n-th Bell number given by A000110.at n=10A242171
• Lesser of twin prime pairs of the form (40n - 21, 40n - 19).at n=32A250025
• Numerators of increasingly better rational approximations to log(3)/log(2) with increasing denominators.at n=23A254351
• Primes p such that p+2, (p+1)||p and (p+1)||(p+2) are primes (where || denotes concatenation in base 10).at n=28A309934