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 A067784 Numbers n such that prime(n+1)^4=prime(n)^4 (mod n). 1
 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 29, 30, 40, 45, 48, 56, 60, 64, 65, 80, 92, 105, 111, 120, 144, 146, 160, 180, 182, 212, 232, 240, 246, 336, 340, 344, 348, 360, 376, 439, 470, 476, 580, 624, 680, 709, 819, 832, 914, 984, 1020, 1058, 1290, 1341, 1352 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Robert Israel, Table of n, a(n) for n = 1..300 MAPLE q:= 2: count:= 0: for n from 1 while count < 100 do   p:= q; q:= nextprime(p);   if q^4 - p^4 mod n = 0 then count:= count+1; A[count]:= n; fi; od: seq(A[i], i=1..count); # Robert Israel, May 16 2017 MATHEMATICA Select[Range[100], Mod[Prime[# + 1]^4 , #] == Mod[Prime[#]^4, #] &] (* G. C. Greubel, May 17 2017 *) CROSSREFS Cf. A030514, A067785. Sequence in context: A336505 A303704 A067939 * A324107 A018744 A018478 Adjacent sequences:  A067781 A067782 A067783 * A067785 A067786 A067787 KEYWORD nonn AUTHOR Benoit Cloitre, Feb 06 2002 STATUS approved

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Last modified January 23 21:55 EST 2021. Contains 340386 sequences. (Running on oeis4.)