Revision History for A134709
(Underlined text is an addition;
strikethrough text is a deletion.)
Showing all changes.
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#5 by Susanna Cuyler at Sat Mar 14 05:55:37 EDT 2020
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#4 by Jinyuan Wang at Sat Mar 14 05:35:58 EDT 2020
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#3 by Jinyuan Wang at Sat Mar 14 05:35:55 EDT 2020
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| DATA
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0, 1, 7, 31, 2047, 32767, 131071, 536870911, 576460752303423487, 154742504910672534362390527, 40564819207303340847894502572031, 42535295865117307932921825928971026431
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| FORMULA
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a(n)=() = (A061652(n)/2) - 1.
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| KEYWORD
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more,nonn
nonn
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| EXTENSIONS
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More terms from Jinyuan Wang, Mar 14 2020
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| STATUS
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approved
editing
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#2 by Russ Cox at Fri Mar 30 17:33:50 EDT 2012
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| AUTHOR
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_Omar E. Pol (info(AT)polprimos.com), _, Nov 07 2007
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Discussion
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| Fri Mar 30
| 17:33
| OEIS Server: https://oeis.org/edit/global/157
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#1 by N. J. A. Sloane at Sat Nov 10 03:00:00 EST 2007
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| NAME
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Even superperfect numbers divided by 2, minus 1.
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| DATA
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0, 1, 7, 31, 2047, 32767, 131071, 536870911, 576460752303423487, 154742504910672534362390527
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| OFFSET
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1,3
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| FORMULA
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a(n)=(A061652(n)/2) - 1.
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| EXAMPLE
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a(5)=2047 because the 5th even superperfect number is 4096 and (4096/2)-1=2047.
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| CROSSREFS
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Cf. A019279, A061652, A133028.
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| KEYWORD
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more,nonn,new
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| AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Nov 07 2007
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| STATUS
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approved
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