id:A165440 - OEIS Search Results

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Primes p such that 2*(Sum of digits of p)+3 is not a prime.

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3, 29, 47, 79, 83, 97, 137, 173, 191, 227, 263, 277, 281, 317, 349, 353, 367, 439, 443, 457, 461, 547, 599, 619, 641, 673, 691, 709, 727, 797, 821, 853, 887, 907, 911, 977, 1019, 1069, 1087, 1091, 1109, 1163, 1181, 1217, 1249, 1307, 1361, 1429, 1433, 1447 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Primes p = A000040(k) such that 2*A007605(k)+3 is composite.`
	FORMULA	`A000040 \ A165439.`
	EXAMPLE	`29 is in the sequence because 2+9=11 and 211+3=25 is not prime.` `1087 is in the sequence because 1+0+8+7=16 and 216+3=35 is not prime.`
	CROSSREFS	`Cf. A165439` `Sequence in context: A167278 A106979 A087209 this_sequence A072306 A071150 A107189` `Adjacent sequences: A165437 A165438 A165439 this_sequence A165441 A165442 A165443`
	KEYWORD	`nonn,base`
	AUTHOR	`Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Sep 19 2009`
	EXTENSIONS	`Keyword:base added by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 21 2009`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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