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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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0
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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; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| a(n) == 0 (mod 9) for n>1. Conjecture: Sequence is infinite.
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EXAMPLE
| 11,1181,1181729 etc. are primes.
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CROSSREFS
| Sequence in context: A187433 A185366 A133549 * A066431 A206086 A045792
Adjacent sequences: A090254 A090255 A090256 * A090258 A090259 A090260
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 27 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Oct 21 2005
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