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Search: id:A155555
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| A155555 |
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Primes n such that number of prime digits of n < number of prime digits of n-th prime. |
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+0
1
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| 11, 19, 31, 41, 59, 61, 87, 71, 101, 103, 107, 109, 131, 137, 139, 149, 151, 181, 191, 199, 211, 241, 269, 281, 307, 311, 331, 337, 349, 367, 389, 401, 409, 419, 439, 449, 457, 461, 463, 467, 479, 491, 499, 503, 509, 521, 569, 587, 599, 601, 613, 619, 641
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Prime digit = 2, 3, 5 or 7.
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EXAMPLE
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If prime=n=11(0) and prime(11)=31(1), then 0<1 and 11=a(1). If prime=n=19(0) and prime(19)=67(1), then 0<1 and 19=a(2). If prime=n=31(1) and prime(31)=127(2), then 1<2 and 31=a(3), etc.
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CROSSREFS
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Cf. A000027, A000040.
Sequence in context: A080821 A094517 A049719 this_sequence A152091 A122869 A106535
Adjacent sequences: A155552 A155553 A155554 this_sequence A155556 A155557 A155558
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KEYWORD
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nonn,base
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AUTHOR
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Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Jan 24 2009
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