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 A165444 Primes obtained from other primes by prefixing a 4. 4
 43, 47, 419, 431, 443, 461, 467, 479, 4127, 4139, 4157, 4211, 4229, 4241, 4271, 4283, 4337, 4349, 4373, 4397, 4409, 4421, 4457, 4463, 4523, 4547, 4643, 4673, 4691, 4733, 4751, 4787, 4877, 4919, 4937, 4967, 41039, 41051, 41117, 41201, 41213, 41231, 41381, 41399 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 Chris Caldwell, The First 10,000 Primes EXAMPLE 4547 is a prime obtained by prefixing a 4 to the prime 547. MATHEMATICA Select[4*10^IntegerLength[#]+#&/@Prime[Range[300]], PrimeQ] (* Harvey P. Dale, Mar 25 2016 *) CROSSREFS Cf. A000040, A165243, A165292 Sequence in context: A330981 A180519 A118485 * A162464 A255224 A161406 Adjacent sequences: A165441 A165442 A165443 * A165445 A165446 A165447 KEYWORD base,nonn AUTHOR Parthasarathy Nambi, Sep 19 2009 EXTENSIONS More terms from Vincenzo Librandi, Sep 20 2009 STATUS approved

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Last modified November 29 12:41 EST 2023. Contains 367445 sequences. (Running on oeis4.)