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A108633 Semiprimes with semiprime sum of factors. +0
1
14, 21, 26, 33, 38, 46, 57, 62, 69, 74, 85, 93, 94, 106, 129, 133, 134, 145, 166, 177, 178, 205, 213, 217, 218, 226, 237, 249, 253, 254, 262, 265, 278, 309, 314, 334, 362, 393, 398, 417, 422, 445, 466, 469, 489, 493, 502, 505, 514, 517, 526, 553, 565, 573, 586 (list; graph; listen)
OFFSET

1,1

EXAMPLE

21=3*7 and 3+7=10=2*5.

MATHEMATICA

Select[Range[800], Plus@@Last/@FactorInteger[ # ]==Plus@@Last/@FactorInteger[(Plus@@First/@FactorInteger[ # ])]==2&]

CROSSREFS

Adjacent sequences: A108630 A108631 A108632 this_sequence A108634 A108635 A108636

Sequence in context: A096017 A006614 A039832 this_sequence A110478 A125967 A006625

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)yahoo.com), Jun 14 2005

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Last modified October 15 09:18 EDT 2008. Contains 145015 sequences.


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