A175013 Sum of digits of n-th semiprime (or biprime).

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

Offset

1,1

Links

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

Maple

seq( A007953(A001358(n)), n=1..120) ; # 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 A307036

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