A104491 - OEIS

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A104491

Prime numbers n for which the square excess of the n-th prime is prime.

2, 5, 13, 19, 23, 37, 67, 71, 83, 107, 109, 113, 139, 157, 173, 199, 271 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	FORMULA	`n such that A102821(n) is prime. n such that A053186(A000040(n)) is an element of A000040.`
	EXAMPLE	`199 is an element of this sequence because 199 is prime and the 199th prime is 1217 and 1217 - 34^2 = 61 and 61 is prime, while 1217 - 35^2 = -8.`
	CROSSREFS	`Cf. A000040, A053186, A102821.` `Sequence in context: A112634 A045364 A045365 * A038950 A019390 A073770` `Adjacent sequences: A104488 A104489 A104490 * A104492 A104493 A104494`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jonathan Vos Post (jvospost3(AT)gmail.com), Mar 10 2005`

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Last modified February 17 11:46 EST 2012. Contains 206011 sequences.