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 A152922 2^(2p-1)/4, where p is A000043(n). 2
 2, 8, 128, 2048, 8388608, 2147483648, 34359738368, 576460752303423488 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Ultraperfect numbers (A139306), divided by 4. LINKS FORMULA a(n) = A139306(n)/4 = A152921(n)/2. CROSSREFS Cf. A000043, A139290, A139306, A152921, A152923. Sequence in context: A081856 A038533 A139290 * A114977 A011822 A307124 Adjacent sequences:  A152919 A152920 A152921 * A152923 A152924 A152925 KEYWORD nonn AUTHOR Omar E. Pol, Dec 15 2008 STATUS approved

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Last modified June 15 17:43 EDT 2019. Contains 324142 sequences. (Running on oeis4.)