a(n) is the first positive number k such that k is alternately a quadratic residue and nonresidue modulo the first n primes, but not the n+1'th.
A377380
a(n) is the first positive number k such that k is alternately a quadratic residue and nonresidue modulo the first n primes, but not the n+1'th.
Terms
- a(0) =1a(1) =2a(2) =11a(3) =41a(4) =26a(5) =5a(6) =671a(7) =89a(8) =59a(9) =1181a(10) =1991a(11) =3755a(12) =21521a(13) =34145a(14) =25994a(15) =137885a(16) =61106a(17) =1503029a(18) =2617439a(19) =1008551a(20) =2897081a(21) =22363295a(22) =33603926a(23) =36518450a(24) =79865294a(25) =185914490a(26) =593068985a(27) =2211452939a(28) =2120224529a(29) =1673286179
External references
- oeis: A377380