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A057328
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First member of a prime quintuplet in a 2p-1 progression.
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11
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1531, 6841, 15391, 16651, 33301, 44371, 57991, 66601, 83431, 105871, 145021, 150151, 165901, 199621, 209431, 212851, 231241, 242551, 291271, 319681, 331801, 346141, 377491, 381631, 385591, 445741, 451411, 478801, 481021, 506791, 507781
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Numbers n such that n remains prime through 4 iterations of function f(x) = 2x - 1.
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LINKS
| Index entries for sequences related to primes in arithmetic progressions
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EXAMPLE
| Quintuplets are (1531,3061,6121,12241,24481),(6841,13681,27361,54721,109441),...
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PROG
| (MAGMA) [ p: p in PrimesUpTo(6*10^5) | forall{q: k in [1..4] | IsPrime(q) where q is 2^k*(p-1)+1} ]; // Bruno Berselli, Nov 23 2011
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CROSSREFS
| Cf. A005382 and A005383; A057326, A057327, A057329, A057330, A005603.
Sequence in context: A030061 A122707 A057327 * A110022 A145982 A088362
Adjacent sequences: A057325 A057326 A057327 * A057329 A057330 A057331
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KEYWORD
| nonn
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Aug 15 2000.
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