31253

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has period 87.at n=22A020426
• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 23.at n=35A051964
• Smallest prime with leading digits the same as those of n^n.at n=4A068840
• Primes p such that p-3 and p+3 are divisible by a cube.at n=29A089201
• Numbers n such that n and the four successive integers produce primes if substituted for x in the polynomial 5x^2+5x+1. See A090562, A090563. Terms show that longer similar chains also exist.at n=19A090100
• Primes of the form 2n^3+3.at n=9A201108
• Primes of the form 2*k^2 + 3.at n=26A201473
• Primes congruent to 5 (mod 504).at n=23A228093
• Number of (n+1) X (1+1) 0..2 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2 X 2 subblock equal.at n=5A236886
• Number of (n+1)X(6+1) 0..2 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock equal.at n=0A236891
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock equal.at n=15A236893
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock equal.at n=20A236893
• Number of partitions of n such that the number of parts having multiplicity 1 is not a part and the number of distinct parts is not a part.at n=48A241445
• a(n+1) is the smallest prime > a(n) such that the digits of a(n) are all (with multiplicity) contained in the digits of a(n+1), with a(1)=5.at n=9A242906
• Primes p such that every suffix of the base-5 representation of p is a prime.at n=45A278697
• Sophie Germain primes p such that p+6 and p-6 are primes.at n=28A278869
• Primes p such that 2*p+1 and 4*p^2+1 are also prime.at n=38A333803
• Prime numbersat n=3369