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A175013 Sum of digits of n-th semiprime (or biprime). 5
4, 6, 9, 1, 5, 6, 3, 4, 7, 8, 6, 7, 8, 11, 12, 10, 13, 6, 10, 12, 13, 8, 11, 15, 11, 14, 10, 13, 14, 15, 10, 12, 13, 14, 7, 3, 7, 10, 11, 4, 5, 6, 12, 7, 8, 6, 7, 8, 10, 11, 11, 14, 15, 8, 13, 16, 15, 16, 12, 14, 16, 14, 3, 4, 5, 7, 8, 11, 6, 7, 8, 10, 11, 12, 5, 10, 10, 12, 13, 15, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000

MAPLE

seq( A007953(A001358(n)), n=1..120) ; [From R. J. Mathar, Aug 12 2010]

MATHEMATICA

Total[IntegerDigits[#]]&/@Select[Range[300], PrimeOmega[#]==2&] (* Harvey P. Dale, Jun 12 2012 *)

CROSSREFS

Cf. A001358.

Sequence in context: A154521 A129112 A239634 * A210616 A238167 A076418

Adjacent sequences:  A175010 A175011 A175012 * A175014 A175015 A175016

KEYWORD

nonn,base

AUTHOR

Juri-Stepan Gerasimov, Apr 04 2010

EXTENSIONS

Entries checked by R. J. Mathar, Aug 12 2010

STATUS

approved

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Last modified December 14 18:21 EST 2018. Contains 318106 sequences. (Running on oeis4.)