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Search: id:A090257
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| A090257 |
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a(1) = 1, then least square such that every partial concatenation is a prime. |
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1
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| 1, 1, 81, 729, 441, 729, 81, 1521, 59049, 1521, 9, 13689, 1089, 159201, 62001, 363609, 4761, 1521, 8649, 1147041, 110889, 29241, 233289, 370881, 558009, 7569, 710649, 59049, 184041, 301401, 56169, 77841, 71289, 233289, 81, 91809, 1535121, 9018009
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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a(n) == 0 (mod 9) for n>1. Conjecture: Sequence is infinite.
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EXAMPLE
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11,1181,1181729 etc. are primes.
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CROSSREFS
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Sequence in context: A139156 A016756 A133549 this_sequence A066431 A045792 A076749
Adjacent sequences: A090254 A090255 A090256 this_sequence A090258 A090259 A090260
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 27 2003
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EXTENSIONS
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More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Oct 21 2005
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