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A129927
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3-almost prime octagonal numbers.
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0
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8, 645, 833, 1045, 1281, 1825, 2465, 2821, 3201, 3605, 4961, 7701, 8965, 12545, 15841, 17633, 18565, 20501, 23585, 24661, 25761, 26885, 28033, 30401, 34133, 36741, 45141, 51221, 52801, 57685, 59361, 62785, 66305, 68101, 71765, 73633
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| A000567 INTERSECT A014612. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 27 2009]
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MAPLE
| A000567 := proc(n) n*(3*n-2) ; end: isA014612 := proc(n) RETURN( numtheory[bigomega](n) = 3) ; end: for n from 1 to 300 do q := A000567(n) ; if isA014612(q) then printf("%d, ", q) ; fi; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 27 2009]
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CROSSREFS
| Sequence in context: A080320 A083942 A027877 * A196800 A196588 A197045
Adjacent sequences: A129924 A129925 A129926 * A129928 A129929 A129930
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KEYWORD
| nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jun 06 2007
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EXTENSIONS
| Corrected and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 27 2009
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