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A120094
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Rows of Pascal's triangle which contain no terms numerically adjacent to odd primes (the 1's at either end are of course numerically adjacent to the even prime 2).
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OFFSET
| 0,1
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COMMENTS
| Apart from the (2^i-1)-th rows, there are no obvious divisibility properties that would explain the coincidence. '1' is the 0-th row.
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EXAMPLE
| The 7th, 15th, 31st, ... (2^i-1)-th rows are all included as pascal's triangle only contains odd terms, thus all numerically adjacent terms are even.
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PROG
| (PARI) for(n=2, 1000, for(k=1, n\2, ok=1; c=n!/k!/(n-k)!; if(ispseudoprime(c+1)||ispseudoprime(c-1), ok=0; break; )); if(ok, print(n)))
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CROSSREFS
| Sequence in context: A117747 A179882 A137196 * A078485 A159695 A014001
Adjacent sequences: A120091 A120092 A120093 * A120095 A120096 A120097
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KEYWORD
| nonn
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AUTHOR
| Phil Carmody (pc+oeis(AT)asdf.org), Aug 15 2006
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