20983

Properties

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 78 ones.at n=27A031846
• Recursive prime generating sequence.at n=60A039726
• 10000n+1, 10000n+3, 10000n+7, 10000n+9 are all primes.at n=10A064963
• Prime numbers occurring at integer Pythagorean distance (radius) from 1 in Ulam square prime-spiral. Primes on axes are excluded.at n=33A078765
• Primes arising in A085042: a(n) = the n-th partial sum of A085042.at n=31A085043
• Primes such that the next n successive differences are identical.at n=15A087562
• List of strictly non-palindromic twin primes {p, p+2}.at n=15A138329
• Primes of the form 88x^2+32xy+127y^2.at n=33A140630
• Primes congruent to 38 mod 59.at n=39A142765
• Primes congruent to 60 mod 61.at n=34A142858
• Number of binary strings of length n with no substrings equal to 0000 0011 or 0101.at n=18A164426
• A213784/12.at n=34A213789
• Primes that are arithmetical average of 100 consecutive primes.at n=9A217985
• Primes p such that 2*p + 59 is a square.at n=29A269789
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 177", based on the 5-celled von Neumann neighborhood.at n=30A270620
• Number of n X 3 0..2 arrays with no element unequal to a strict majority of its king-move neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.at n=12A279897
• Primes that can be generated by the concatenation in base 3, in descending order, of two consecutive integers read in base 10.at n=25A287301
• Primes that can be generated by the concatenation in base 7, in descending order, of two consecutive integers read in base 10.at n=19A287309
• a(n) is the least prime of the form prime(n)*p + prime(n+1)*q + prime(n+2)*r where p,q,r are consecutive primes.at n=32A340817
• Twin primes p such that the absolute difference of p and the reverse of its twin is a twin prime.at n=35A342216