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 A161747 Primes of the form x^5-y^4, where x,y >= 1. 0
 31, 227, 1051, 3109, 7151, 15511, 18127, 30367, 32143, 32687, 144719, 151051, 165311, 186343, 234191, 302399, 369997, 371281, 374239, 407503, 454303, 509263, 531263, 537743, 759359, 1053007, 1088081, 1182287, 1185601, 1354321, 1381441 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS If a prime has multiple representations of the format, it is entered only once. LINKS FORMULA If x^5-y^4 is prime for integers x,y list without duplicates. EXAMPLE 2^5 - 1^4 = 31. PROG (PARI) diffpowers(n, m) = { local(a, c=0, c2=0, j, k, y); a=vector(floor(n^2/log(n^2))); for(j=1, n, for(k=1, n, y=j^m-k^(m-1); if(ispseudoprime(y), c++; \\ print(j", "k", "y); a[c]=y; ); ); ); a=vecsort(a); for(j=2, length(a), if(a[j]!=a[j-1]&&a[j]!=0, c2++; print1(a[j]", "); if(c2>100, break); ); ); } CROSSREFS Sequence in context: A075931 A142440 A075932 * A059899 A140846 A082544 Adjacent sequences:  A161744 A161745 A161746 * A161748 A161749 A161750 KEYWORD nonn AUTHOR Cino Hilliard, Jun 17 2009 STATUS approved

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Last modified September 30 02:48 EDT 2020. Contains 337432 sequences. (Running on oeis4.)