id:A153347 - OEIS Search Results

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Numbers n such that 7n-4 is not prime

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	OFFSET	`1,1`
	COMMENT	`Of course n is even`
	FORMULA	`Let p= prime; n=(p^2+2p+4)/7 mod (p); or, n=(p^2+4p+4)/7 mod (p); or, n=(p^2+10p+4)/7 mod (p); or, n=(p^2+12p+4)/7 mod (p).`
	CROSSREFS	`Cf. A024903` `Sequence in context: A138204 A080645 A024413 this_sequence A153167 A047237 A039028` `Adjacent sequences: A153344 A153345 A153346 this_sequence A153348 A153349 A153350`
	KEYWORD	`nonn`
	AUTHOR	`Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 24 2008`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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