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Search: id:A068712
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| A068712 |
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Primes of the form 10*2^k + 3. |
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+0
5
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| 13, 23, 43, 83, 163, 643, 1283, 10243, 20483, 1310723, 5242883, 335544323, 1342177283, 21474836483, 85899345923, 43980465111043, 87960930222083, 5629499534213123, 22517998136852483, 1441151880758558723
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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1283 is a term as a concatenation of 2^7 and 3.
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MATHEMATICA
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lst={}; Do[p=10*2^n+3; If[PrimeQ[p], AppendTo[lst, p]], {n, 0, 2*5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 27 2009]
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PROGRAM
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(PARI) for(n=1, 150, if(isprime(2^n*10+3)==1, print1(2^n*10+3, ", ")))
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CROSSREFS
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Sequence in context: A165350 A112394 A067227 this_sequence A103166 A154863 A155049
Adjacent sequences: A068709 A068710 A068711 this_sequence A068713 A068714 A068715
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 05 2002
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EXTENSIONS
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More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 09 2002
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