20899

Properties

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 80 ones.at n=20A031848
• Increasing partial quotients of e^Pi - Pi^e (A063504).at n=10A064441
• Number of digits in 10^n-th Fibonacci number.at n=5A068070
• Prime numbers occurring at integer Pythagorean distance (radius) from 1 in Ulam square prime-spiral. Primes on axes are excluded.at n=32A078765
• Prime(prime(n)) when prime(prime(n)) and n are twin primes.at n=19A087394
• Primes from merging of 5 successive digits in decimal expansion of Pi.at n=9A104825
• Number of decimal digits in Lucas(10^n).at n=5A114469
• Iterates of A122237, starting from 5.at n=7A122244
• Primes p of the form : p+p^2+p^3-+8=prime.at n=20A154823
• Smaller member of a pair (p,q) of cousin primes such that p and q are in different centuries.at n=19A160440
• Primes p such that sod(p)=2*sod(nextprime(p)).at n=36A175546
• Prime numbers 3*n-2 such that n, 2*n-1 and 3*n-2 are prime.at n=32A180025
• Primes which are the sum of three distinct positive cubes in two or more distinct ways.at n=17A180088
• Primes p such that p - 2 and p^3 - 2 are also prime.at n=45A240126
• Greater of twin primes of (40n-23,40n-21).at n=26A244505
• Primes for which the concatenation of the digits in the even positions and the concatenation of the digits in the odd positions are squares.at n=31A275797
• Expansion of 1/(1 - x*Product_{k>=1} (1 + x^(2*k-1))).at n=17A302017
• Primes having only {0, 2, 8, 9} as digits.at n=24A386055
• Lesser of cousin happy primes.at n=8A387896
• Prime numbersat n=2351