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A053343 Square-free terms of A050530 with 2 prime divisors. +0
1
15, 33, 35, 51, 65, 77, 87, 91, 95, 119, 123, 143, 161, 177, 185, 209, 213, 215, 217, 221, 247, 259, 287, 303, 321, 329, 335, 341, 371, 377, 395, 403, 407, 411, 427, 437, 447, 469, 473, 485, 511, 515, 527, 533, 537, 545, 551, 573, 581, 591, 611, 629, 635 (list; graph; listen)
OFFSET

1,1

FORMULA

n=pq such that n-Phi[n]=pq-(p-1)(q-1)=p+q-1=r is a prime

CROSSREFS

Sequence in context: A089966 A050384 A142862 this_sequence A068081 A089967 A064900

Adjacent sequences: A053340 A053341 A053342 this_sequence A053344 A053345 A053346

KEYWORD

nonn

AUTHOR

Labos E. (labos(AT)ana.sote.hu), Jan 05 2000

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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