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A073060
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Multiplication table for 1 and odd primes, read by antidiagonals.
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0
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1, 3, 3, 5, 9, 5, 7, 15, 15, 7, 11, 21, 25, 21, 11, 13, 33, 35, 35, 33, 13, 17, 39, 55, 49, 55, 39, 17, 19, 51, 65, 77, 77, 65, 51, 19, 23, 57, 85, 91, 121, 91, 85, 57, 23, 29, 69, 95, 119, 143, 143, 119, 95, 69, 29, 31, 87, 115, 133, 187, 169, 187, 133, 115, 87, 31, 37, 93, 145
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Entries in table are sometimes called semiprimes or biprimes (see A001358).
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EXAMPLE
| Table begins
1 3 5 7 11 13 ...
3 9 15 21 33 ...
5 15 25 35 ...
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MAPLE
| a[1] := 1:for j from 2 to 100 do a[j] := ithprime(j):od:s := 0:for j from 1 to 16 do for i from 1 to j do s := s+1:b[s] := a[j-i+1]*a[i]; od:od:seq(b[q], q=1..s);
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CROSSREFS
| Sequence in context: A200737 A200741 A098353 * A183526 A087343 A079586
Adjacent sequences: A073057 A073058 A073059 * A073061 A073062 A073063
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KEYWORD
| nonn,tabl,easy
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AUTHOR
| Stuart M. Ellerstein (ellerstein(AT)aol.com), Aug 16 2002
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EXTENSIONS
| Corrected and extended by Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Jan 28 2003
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