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A078443 Numbers which are both interprime and semiprime. 1
4, 6, 9, 15, 21, 26, 34, 39, 69, 86, 93, 111, 129, 134, 205, 217, 254, 274, 309, 334, 381, 386, 393, 446, 453, 473, 489, 501, 515, 566, 667, 687, 723, 771, 803, 879, 933, 939, 974, 1003, 1011, 1126, 1167, 1207, 1226, 1234, 1243, 1286, 1294, 1299, 1313, 1465 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..52.

EXAMPLE

a[8]=39 because 39=(37+41)/2 and 39=3*13

CROSSREFS

Cf. A024675, A001358.

Sequence in context: A137371 A179463 A086697 * A085751 A116589 A118688

Adjacent sequences:  A078440 A078441 A078442 * A078444 A078445 A078446

KEYWORD

nonn

AUTHOR

Lior Manor Dec 31 2002

STATUS

approved

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Last modified May 24 01:37 EDT 2013. Contains 225613 sequences.