id:A028416 - OEIS Search Results

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Primes p such that the decimal expansion of 1/p has a periodic part of even length.

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7, 11, 13, 17, 19, 23, 29, 47, 59, 61, 73, 89, 97, 101, 103, 109, 113, 127, 131, 137, 139, 149, 157, 167, 179, 181, 193, 197, 211, 223, 229, 233, 241, 251, 257, 263, 269, 281, 293, 313, 331, 337, 349, 353, 367, 373, 379, 383, 389, 401, 409, 419, 421, 433 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Primes whose reciprocals have even period length.` `A002371(A049084(a(n))) mod 2 == 0.` `Not the same as A040121: a(33)=241 is not in A040121.`
	LINKS	`Index entries for sequences related to decimal expansion of 1/n.`
	CROSSREFS	`Cf. A087000.` `Sequence in context: A135776 A067831 A086998 this_sequence A040121 A091554 A111980` `Adjacent sequences: A028413 A028414 A028415 this_sequence A028417 A028418 A028419`
	KEYWORD	`nonn,base`
	AUTHOR	`Mario Velucchi (mathchess(AT)velucchi.it)`
	EXTENSIONS	`More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 29 2003`

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Last modified July 19 08:04 EDT 2008. Contains 142098 sequences.

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