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A068712
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Primes of the form 10*2^k + 3.
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..38
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EXAMPLE
| 1283 is a term as a concatenation of 2^7 and 3.
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MATHEMATICA
| Select[10*2^Range[0, 60]+3, PrimeQ] (* From Harvey P. Dale, Feb 04 2011 *)
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PROG
| (PARI) for(n=1, 150, if(isprime(2^n*10+3)==1, print1(2^n*10+3, ", ")))
(MAGMA) [a: n in [0..100] | IsPrime(a) where a is 10*2^n + 3]; // Vincenzo Librandi, Dec 08 2011
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CROSSREFS
| Sequence in context: A119488 A112394 A067227 * A103166 A154863 A194156
Adjacent sequences: A068709 A068710 A068711 * A068713 A068714 A068715
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 05 2002
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EXTENSIONS
| More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 09 2002
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