23761

Properties

Appears in sequences

• Smallest prime p such that the product of q/(q-1) over the primes from prime(n) to p is greater than 2.at n=34A001275
• a(n) = Sum_{k=0..floor(n/2)} A026637(n-k, k).at n=21A026647
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 98 ones.at n=25A031866
• Numerators of continued fraction convergents to sqrt(330).at n=3A041622
• Primes of the form F(i)^2 + F(j)^2, where F() are Fibonacci numbers.at n=11A045703
• Define C(n) by the recursion C(0) = 1 + I where I^2 = -1, C(n+1) = 1/(1+C(n)); then a(n) = (-1)^n/Im(C(n)) where Im(z) is the imaginary part of the complex number z.at n=10A069921
• Shallow diagonal of triangular spiral in A051682.at n=36A081275
• Primes of the form 2*p^2 - 1, where p is prime.at n=10A092057
• Balanced primes of order eight.at n=30A096700
• Initial terms of chains consisting of four consecutive integers, for none of which is the value of sigma-function divisible by six.at n=7A097020
• Primes that are a concatenation of 2, 3 and a prime.at n=25A101218
• Numbers k such that k concatenated with k+3 gives the product of two numbers which differ by 5.at n=6A116179
• Numbers k such that k concatenated with k+7 gives the product of two numbers which differ by 3.at n=5A116205
• Home primes whose homeliness is greater than 4.at n=16A133963
• Home primes whose homeliness is greater than 5.at n=4A133965
• Home primes whose homeliness is greater than 6.at n=3A133967
• Home primes whose homeliness is 7.at n=1A133968
• Prime numbers p such that p +- ((p-1)/5) are primes.at n=19A137714
• Primes congruent to 32 mod 61.at n=38A142830
• Primes of the form 648*k^2 + 72*k + 1.at n=2A154510