18049

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 10.at n=25A031423
• Numerators of continued fraction convergents to sqrt(141).at n=7A041258
• Numerators of continued fraction convergents to sqrt(564).at n=7A042080
• Primes setting records for earliest alphabetical position in American English.at n=11A050444
• a(n) is the n-th prime whose decimal expansion begins with the decimal expansion of n.at n=17A077345
• Third row of Pascal-(1,7,1) array A081582.at n=24A081593
• Last term of prime quadruples.at n=16A090258
• Primes of the form 256n+129.at n=18A105130
• Beginning with 3, least number such that concatenation of first n terms and its digit reversal both are primes.at n=38A111382
• a(n) = number of solutions to the Diophantine equation x+y^2+z^3=n^4 with positive x,y,z.at n=19A121876
• Primes of the form 76x^2+20xy+145y^2.at n=35A140629
• Primes congruent to 29 mod 53.at n=41A142559
• Primes congruent to 54 mod 59.at n=36A142781
• Primes congruent to 54 mod 61.at n=35A142852
• Primes with distinct nonprime digits.at n=42A155024
• Primes p such that 6p-7, 6p-5, 6p-1 are all prime.at n=40A157042
• a(n) = 128*n^2 - 32*n + 1.at n=11A157331
• a(n) = 128*n^2 + 2528*n + 12481.at n=1A157436
• a(n) = 2048*n^2 - 128*n + 1.at n=2A157448
• a(n) = 50*n^2 - 1.at n=18A157919