This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A145297 Smallest k such that k^2+1 is divisible by A002144(n)^4. 6
 182, 239, 27493, 34522, 800982, 1251967, 623098, 6304056, 6459524, 20099637, 22709274, 35764191, 40317977, 54397650, 166206108, 187800003, 165728858, 152475014, 282599844, 312923750, 154613663, 485200742, 912190662, 548850444 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE a(1) = 182 since A002144(1) = 5, 182^2+1 = 33125 = 5^4*53 and for no k < 182 does 5^4 divide k^2+1. PROG (PARI) {e=4; forprime(p=2, 250, if(p%4==1, q=p^e; m=q; while(!ispower(m-1, 2, &n), m=m+q); print1(n, ", ")))} CROSSREFS Cf. A002144 (primes of form 4n+1), A002313 (-1 is a square mod p), A059321, A145296, A145298, A145299. Sequence in context: A054985 A124185 A218563 * A056091 A272361 A158553 Adjacent sequences:  A145294 A145295 A145296 * A145298 A145299 A145300 KEYWORD nonn AUTHOR Klaus Brockhaus, Oct 11 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 15 22:19 EDT 2019. Contains 324145 sequences. (Running on oeis4.)