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Search: id:A090887
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| A090887 |
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Irregular primes the indices of whose indices are irregular primes of order two. |
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+0
1
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| 12923, 19577, 26021, 41203, 41953, 53437, 65309, 68399, 117511, 134731, 137713, 142327, 149861, 155821, 164701, 167887, 192347, 197647, 216901, 224911, 231323, 236063, 246049, 250031, 268999, 271723, 273787, 289543, 317959, 331519, 338141
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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The number of primes in this sequence is infinite.
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EXAMPLE
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37 is the first irregular prime, 613 is the 37th irregular prime, i.e. iprime[iprime[1]] = 613, and 12923 is the 613th irregular prime.
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CROSSREFS
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Sequence in context: A140917 A031805 A086004 this_sequence A028385 A138762 A139777
Adjacent sequences: A090884 A090885 A090886 this_sequence A090888 A090889 A090890
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Feb 12 2004
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