42641

Properties

Appears in sequences

• Denominators of continued fraction convergents to sqrt(355).at n=10A041673
• Denominators of continued fraction convergents to sqrt(663).at n=9A042275
• Prime number spiral (clockwise, West spoke).at n=33A054570
• Sixth term of weak prime sextet: p(m-4)-p(m-5) < p(m-3)-p(m-4) < p(m-2)-p(m-3) < p(m-1)-p(m-2) < p(m)-p(m-1).at n=15A054833
• Primes p of the form k*(k + 1) - 1 such that p and p + 2 are twin primes.at n=26A088486
• Expansion of (7 +4*x -5*x^2 -7*x^3) / ((1-x)*(1-x^2-x^3)).at n=31A103485
• Expansion of (-1+3*x)/(5*x^2 + 1 - 2*x).at n=13A116484
• Numerator of real part of (3*i - 1)^(-n).at n=13A124869
• Primes of the form 10n^2+6n+1.at n=23A154409
• Lesser of twin primes p1 such that p1*p2+-6 are prime numbers.at n=16A174955
• Lesser of twin primes p1 such that p1*p2-4 and p1*p2-6 are twin prime numbers.at n=20A174957
• Primes p such that x^41 = 2 has a solution mod p, and p is congruent to 1 mod 41.at n=3A190758
• Primes of the form 8n^2 + 9.at n=26A201705
• Primes p such that p = q^2 + 8*r^2 where q and r are also primes.at n=31A260556
• T(n,k) is an array read by rows, with n > 0 and k=1..4, where row n gives four prime numbers in increasing order with locations in right angles of each concentric square drawn on a distorted version of the Ulam spiral.at n=19A271725
• Primes p such that q^2 - p^2 + 1 is the square of a composite number where p and q are consecutive primes.at n=37A316934
• Primes p such that q = p mod A001414(p-1) = p mod A001414(p+1) is prime.at n=31A339182
• Prime numbersat n=4456