A164580 - OEIS

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A164580

Primes of the form p^2 + (p+1)/2 where p is also prime.

11, 53, 127, 541, 977, 1871, 3511, 4523, 5077, 11503, 16193, 19391, 22877, 57241, 63127, 80231, 129061, 134873, 143831, 229681, 241327, 344863, 359101, 398477, 418933, 434611, 619763, 658127, 745201, 845021, 966781, 982577, 1063477, 1130501, 1371827 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	FORMULA	`a(n) = (A154427(n))^2 + ( A154427(n)+1)/2.`
	EXAMPLE	`For p=3, p^2+(p+1)/2=11, prime, which adds 11 to the sequence. For p=7, p^2+(p+1)/2=53, which adds 53 to the sequence.`
	CROSSREFS	`Cf. A154427` `Sequence in context: A045471 A086715 A178453 * A141893 A093198 A093864` `Adjacent sequences: A164577 A164578 A164579 * A164581 A164582 A164583`
	KEYWORD	`nonn`
	AUTHOR	`Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 17 2009`
	EXTENSIONS	`Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 26 2009`

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Last modified February 16 07:39 EST 2012. Contains 205881 sequences.