id:A117249 - OEIS Search Results

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Prime numbers n for which the number of prime numbers smaller than n is also a prime number.

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5, 7, 13, 19, 37, 61, 71, 89, 113, 131, 163, 181, 193, 223, 251, 281, 293, 337, 359, 373, 409, 433, 463, 521, 557, 569, 593, 601, 619, 719, 743, 787, 809, 863, 881, 929, 971, 997, 1033, 1069, 1091, 1163, 1181, 1213, 1223, 1301, 1423, 1439, 1451, 1481, 1511 (list; graph; listen)

	OFFSET	`0,1`
	EXAMPLE	`163 is in the sequence because (1) it is a prime number, (2) there are 37 prime numbers smaller than 163 and 37 is also a prime number.`
	CROSSREFS	`Cf. A000720.` `Sequence in context: A074304 A072677 A063910 this_sequence A045444 A129782 A080829` `Adjacent sequences: A117246 A117247 A117248 this_sequence A117250 A117251 A117252`
	KEYWORD	`base,nonn`
	AUTHOR	`Luc Stevens (lms022(AT)yahoo.com), Apr 23 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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