18671

Properties

Appears in sequences

• Number of partitions of floor(5n/2)-1 into n nonnegative integers each no more than 5.at n=41A001976
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones.at n=20A031846
• Numbers whose base-5 representation contains exactly three 1's and three 4's.at n=28A045262
• Primes p whose reciprocal has period (p-1)/10.at n=27A056215
• Primes which remain prime after one and after two applications of the rotate-and-add operation of A086002.at n=11A086003
• Expansion of x(1-x^2-x^3)/((1-x)(1-x-x^2))^2.at n=15A113684
• Primes congruent to 5 mod 61.at n=35A142803
• Primes p such that (p reversed)+ 8 is a square.at n=41A167470
• Smallest prime(k) such that the concatenation prime(k)//prime(k+1)//...//prime(k+n-1) represents an emirp.at n=22A173448
• Larger of pairs of emirps (A006567) whose difference with the (smaller) reversal is a triangular number (A000217).at n=16A217286
• Primes p such that f(f(p)) is prime, where f(x) = x^4 + x^3 + x^2 + x + 1 = A053699(x).at n=19A237445
• Number of partitions p of n such that the number of parts is a part and max(p) - min(p) is not a part.at n=49A241384
• Consider two consecutive primes {p,q} such that P=2p+q and Q=2q+p are both prime. The sequence gives primes P.at n=39A248482
• Numbers k such that 5*10^k + 57 is prime.at n=20A295392
• Emirps p such that (p*q) mod (p+q) is also an emirp, where q is the digit reversal of p.at n=32A355651
• Emirps p such that 2*p - reverse(p) is also an emirp.at n=21A358689
• Numerators of the partial sums of the reciprocals of the alternating sum of divisors function (A206369).at n=42A379619
• Prime numbersat n=2132