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A068583
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p and q are primes. p^x - q^y = 2^h. ( p != q, h=>0, x>1, y>1 ) : sequence gives p^x arranged in increasing order.
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0
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OFFSET
| 0,1
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REFERENCES
| R. K. Guy, Unsolved Problems in Number Theory, D9.
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EXAMPLE
| 3^2-2^3=2^0, 5^2-3^2=2^4, 3^3-5^2=2, 3^4-7^2=2^5, 5^3-11^2=2^2, 71^2-17^3=2^7.
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CROSSREFS
| Sequence in context: A117580 A020308 A108989 * A074852 A020252 A076486
Adjacent sequences: A068580 A068581 A068582 * A068584 A068585 A068586
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KEYWORD
| hard,nonn
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AUTHOR
| Naohiro Nomoto (n_nomoto(AT)yabumi.com), Mar 27 2002
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