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A100021
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a(n) = 3*prime(n) - prime(n+1) - 3.
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3
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0, 1, 5, 7, 17, 19, 29, 31, 37, 53, 53, 67, 77, 79, 85, 97, 113, 113, 127, 137, 137, 151, 157, 167, 187, 197, 199, 209, 211, 209, 247, 253, 269, 265, 293, 293, 305, 319, 325, 337, 353, 349, 377, 379, 389, 383, 407, 439, 449, 451, 457, 473, 469, 493, 505, 517, 533, 533, 547
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OFFSET
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1,3
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COMMENTS
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Except for the initial term, a(n)==(1,5) mod 6.
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LINKS
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FORMULA
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MAPLE
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f:=n->3*ithprime(n)-ithprime(n+1)-3;
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MATHEMATICA
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3#[[1]]-#[[2]]-3&/@Partition[Prime[Range[80]], 2, 1] (* Harvey P. Dale, Oct 13 2018 *)
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PROG
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(PARI) a(n) = 3*prime(n) - prime(n+1) - 3; \\ Michel Marcus, Jan 31 2023
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CROSSREFS
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KEYWORD
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nonn,less
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AUTHOR
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EXTENSIONS
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Corrected by Neven Juric (neven.juric(AT)apis-it.hr), rechecked by N. J. A. Sloane, Jun 13 2006
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STATUS
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approved
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