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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A058040 Numbers k such that if p_1,p_2,...,p_m, m>1, are the prime factors of k, then there is some b>0 such that k = Sum_{i=1..m} b^(p_i). 0 12, 36, 576, 16464 (list; graph; refs; listen; history; text; internal format) OFFSET 1,1 COMMENTS No others < 1000000. No others <= 10^9. - Sean A. Irvine, Jul 19 2022 LINKS Table of n, a(n) for n=1..4. EXAMPLE 12=2^2*3=2^2+2^3 (b=2); 36=2^2*3^2=3^2+3^3 (b=3); 576=2^6*3^2=8^2+8^3 (b=8); 16464=2^4*3*7^3=4^2+4^3+4^7 (b=4). CROSSREFS Sequence in context: A216381 A085331 A225100 * A130164 A144973 A043358 Adjacent sequences: A058037 A058038 A058039 * A058041 A058042 A058043 KEYWORD nonn AUTHOR Naohiro Nomoto, Nov 21 2000 EXTENSIONS Offset corrected and title clarified by Sean A. Irvine, Jul 19 2022 STATUS approved

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Last modified August 18 07:06 EDT 2024. Contains 375255 sequences. (Running on oeis4.)