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Search: id:A121172
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| A121172 |
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Smallest integer k>0 such that k*10^n + 1 is a prime. |
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+0
4
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| 1, 1, 3, 7, 7, 22, 3, 6, 6, 3, 19, 18, 4, 39, 6, 13, 37, 15, 15, 6, 16, 9, 96, 61, 19, 6, 9, 3, 33, 63, 57, 117, 55, 49, 30, 3, 28, 6, 42, 24, 36, 72, 21, 60, 6, 24, 33, 61, 21, 85, 31, 49, 13, 93, 18, 90, 9, 16, 135, 19, 55, 9, 135, 60, 6, 30, 3, 16, 115, 114, 19, 99, 15, 147, 171, 42
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Corresponding primes are 11,101,3001,70001,700001,22000001,30000001,600000001,6000000001,30000000001,1900000000001,18000000000001,40000000000001,3900000000000001,6000000000000001,130000000000000001,3700000000000000001,15000000000000000001,150000000000000000001,600000000000000000001,...
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EXAMPLE
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a(1) = 1 because A030430[1] = 11 is a smallest prime of form 10*k + 1.
a(2) = 1 because A062800[1] = 101 is a smallest prime of form 100*k + 1.
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CROSSREFS
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Cf. A030430, A062800.
Adjacent sequences: A121169 A121170 A121171 this_sequence A121173 A121174 A121175
Sequence in context: A098581 A085420 A113833 this_sequence A077629 A004794 A086839
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 14 2006
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