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A109288 Semiprimes equal to p*q + 1, where p and q are distinct primes. 3
15, 22, 34, 35, 39, 58, 86, 87, 94, 95, 119, 123, 134, 142, 143, 146, 159, 178, 202, 203, 206, 214, 215, 218, 219, 254, 299, 302, 303, 327, 335, 382, 394, 395, 446, 447, 454, 482, 502, 515, 527, 538, 543, 554, 566, 623, 634, 635, 695, 698, 699, 707, 718, 746 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

PROG

(PARI) for(i=1, 1000, if(bigomega(i)==2&&bigomega(i+1)==2&&issquare(i)==0, print1(i+1, ", "))) (Klasen)

CROSSREFS

Cf. A109287, A109289, A109290.

Sequence in context: A038753 A006615 A114867 * A018889 A186525 A236107

Adjacent sequences:  A109285 A109286 A109287 * A109289 A109290 A109291

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Aug 20 2005

EXTENSIONS

More terms from Lambert Klasen (lambert.klasen(AT)gmx.net), Aug 21 2005

STATUS

approved

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Last modified December 2 19:13 EST 2016. Contains 278683 sequences.