id:A068677 - OEIS Search Results

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Number which yields a prime when a 7 is prefixed or suffixed to it.

+0
3

1, 3, 9, 19, 27, 33, 39, 57, 61, 87, 97, 109, 121, 127, 129, 159, 177, 187, 213, 229, 237, 243, 247, 283, 321, 351, 369, 417, 433, 451, 459, 481, 487, 507, 523, 529, 541, 547, 573, 589, 603, 621, 639, 673, 691, 699, 717, 723, 741, 753, 757, 793, 823, 829, 853 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`129 belongs to this sequence as 1297 as well as 7129 both are primes.`
	CROSSREFS	`Cf. A068673, A068674.` `Sequence in context: A056259 A056682 A032670 this_sequence A069832 A057257 A029464` `Adjacent sequences: A068674 A068675 A068676 this_sequence A068678 A068679 A068680`
	KEYWORD	`base,easy,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 02 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 17 2002`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

AT&T Labs Research