40031

Properties

Appears in sequences

• Numbers whose least quadratic nonresidue (A020649) is 19.at n=14A025027
• Primes with 19 as smallest positive primitive root.at n=32A061331
• Positions of non-crossing fixed-point-free involutions encoded by A014486 in A055089. Permutation of A064640.at n=21A064638
• Positions of non-crossing fixed-point-free involutions encoded by A014486 (after reflection) in A055089. Permutation of A064640.at n=21A064639
• Positions of non-crossing fixed-point-free involutions (encoded by A014486) in A055089, sorted to ascending order.at n=21A064640
• List of Ormiston prime pairs.at n=21A072274
• A Langford-like sequence.at n=45A108401
• Odd numbers n for which 19 is the smallest i (>= 1) with Jacobi symbol J(i,n) getting either a value 0 or -1.at n=21A112078
• a(n) is the n-th prime of the form x^2+n.at n=30A128968
• Primes in the sequence A003294 of certain fourth powers bases.at n=28A134820
• Primes where the first digit equals the sum of all the other digits.at n=27A156307
• Least prime k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x.at n=34A189559
• Least odd number k such that x' = k has n solutions, where x' is the arithmetic derivative (A003415) of x.at n=34A189560
• Numbers n such that (43^n - 1)/42 is prime.at n=5A240765
• Numbers k where k^2 is an anagram of (k+2)^2.at n=15A261749
• Number of permutations p of [n] such that 0p has a nonincreasing jump sequence.at n=10A291685
• Numbers k such that (56*10^k + 403)/9 is prime.at n=21A294483
• Prime numbersat n=4206