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A127329
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Semiprimes equal to the sum of three primes in arithmetic progression.
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0
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15, 21, 33, 39, 51, 57, 69, 87, 93, 111, 123, 129, 141, 159, 177, 183, 201, 213, 219, 237, 249, 267, 291, 303, 309, 321, 327, 339, 381, 393, 411, 417, 447, 453, 471, 489, 501, 519, 537, 543, 573, 579, 591, 597, 633, 669, 681, 687, 699, 717, 723, 753, 771, 789
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(1) = 15 because 15 = 3 + 5 + 7;
a(2) = 21 because 21 = 3 + 7 + 11.
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CROSSREFS
| Sequence in context: A046404 A198680 A177516 * A099610 A043326 A179996
Adjacent sequences: A127326 A127327 A127328 * A127330 A127331 A127332
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KEYWORD
| easy,nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Mar 30 2007
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EXTENSIONS
| Corrected (57 =7+19+31), 87 =5+29+53 etc. inserted) by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 22 2010
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