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 A239634 Initial digits of semiprimes in decimal representation. 3
 4, 6, 9, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) = A000030(A001358(n)). LINKS Reinhard Zumkeller, Table of n, a(n) for n = 1..10000 MATHEMATICA First[IntegerDigits[#]]&/@Select[Range[300], PrimeOmega[#]==2&] (* Harvey P. Dale, Jul 24 2017 *) PROG (Haskell) a239634 = a000030 . a001358 CROSSREFS Cf. A239639 (run lengths), A106146 (last digits). Sequence in context: A106146 A154521 A129112 * A175013 A210616 A238167 Adjacent sequences: A239631 A239632 A239633 * A239635 A239636 A239637 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Mar 23 2014 STATUS approved

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Last modified August 9 10:37 EDT 2024. Contains 375040 sequences. (Running on oeis4.)