id:A084201 - OEIS Search Results

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Primes n such that the sum of the digits is prime and the sum of the digits of 2n is also prime.

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7, 29, 47, 61, 83, 137, 139, 151, 173, 191, 193, 227, 229, 263, 281, 283, 317, 337, 353, 373, 409, 461, 463, 557, 577, 599, 601, 641, 643, 733, 757, 797, 821, 823, 887, 911, 977, 1019, 1039, 1051, 1091, 1093, 1109, 1129, 1163, 1181, 1217, 1237, 1291 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Note that 137 and 139 are twin primes.` `A049084(A007953(a(n)))A049084(A007953(2a(n))) > 0. - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jun 26 2003`
	EXAMPLE	`2+9=11=prime for 29 and 5+8=13=prime for 58=229;` `1+3+7=11=prime for 137 and 2+7+4=13=prime for 274=2137;` `1+3+9=13=prime for 139 and 2+7+8=17=prime for 278=2*139.`
	CROSSREFS	`Sequence in context: A075583 A103603 A045465 this_sequence A031380 A005698 A080185` `Adjacent sequences: A084198 A084199 A084200 this_sequence A084202 A084203 A084204`
	KEYWORD	`base,nonn`
	AUTHOR	`CAPELLE Patrick (patrick.capelle(AT)clearwire.be), Jun 20 2003`
	EXTENSIONS	`More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jun 26 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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