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A108181
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Semiprimes of the form 4n + 1.
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2
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9, 21, 25, 33, 49, 57, 65, 69, 77, 85, 93, 121, 129, 133, 141, 145, 161, 169, 177, 185, 201, 205, 209, 213, 217, 221, 237, 249, 253, 265, 289, 301, 305, 309, 321, 329, 341, 361, 365, 377, 381, 393, 413, 417, 437, 445, 453, 469, 473, 481, 485, 489, 493, 497
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Either a(n)=(4*i+1)*(4*j+1) or a(n)=(4*i+3)*(4*j+3); - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 15 2005
A107978 is a subsequence. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 15 2005
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LINKS
| K. Ford, Jason Sneed, Chebyshev's Bias for products of two primes, Exper. Math. 19 (4) (2010) 385-398
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CROSSREFS
| Cf. A080774, A001358, A002144, A002145.
Sequence in context: A143791 A091113 A188159 * A173456 A192192 A053795
Adjacent sequences: A108178 A108179 A108180 * A108182 A108183 A108184
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KEYWORD
| easy,nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jun 14 2005
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EXTENSIONS
| Corrected and extended by Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 15 2005
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