id:A103144 - OEIS Search Results

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Decimal primes whose decimal representation in hex is also prime.

+0
1

2, 3, 5, 7, 11, 13, 17, 29, 43, 47, 53, 59, 61, 67, 71, 83, 89, 97, 101, 107, 137, 139, 151, 167, 191, 199, 223, 233, 239, 241, 251, 257, 269, 277, 281, 283, 293, 313, 337, 347, 359, 373, 397, 409, 419, 443, 449, 463, 503, 509, 557, 577, 593, 599, 607, 617, 641 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Top 1067 elements listed.`
	FORMULA	`a = primes(300000); j = 0; for i = 1:19000 b = dec2hex(a(i)); c = num2str(b); d = str2num(c); if d < 2^32 if isprime(d) j = j + 1; e(j) = d; end; end; end;`
	EXAMPLE	`11 is prime` `Hex(11) = 17 is prime`
	PROGRAM	`MatLab`
	CROSSREFS	`Cf. A089971.` `Sequence in context: A068669 A100553 A007693 this_sequence A105909 A086498 A055387` `Adjacent sequences: A103141 A103142 A103143 this_sequence A103145 A103146 A103147`
	KEYWORD	`easy,nonn`
	AUTHOR	`Lei Zhou (lzhou5(AT)emory.edu), Jan 26 2005`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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