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 A134710 a(n) = n-th even superperfect number divided by 2^n. 1
 1, 1, 2, 4, 128, 1024, 2048, 4194304, 2251799813685248, 302231454903657293676544, 39614081257132168796771975168, 20769187434139310514121985316880384 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS a(13) and a(14) have 153 and 179 digits respectively and are too large to include here. - R. J. Mathar, Jan 07 2008 LINKS Table of n, a(n) for n=1..12. Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos. FORMULA a(n)=A061652(n)/(2^n). EXAMPLE a(5)=128 because the 5th even superperfect number is 4096 and 2^5=32 and 4096/32=128. MAPLE A000043 := proc(n) op(n, [2, 3, 5, 7, 13, 17, 19, 31, 61, 89, 107, 127, 521, 607, 1279, 2203, 2281, 3217, 4253, 4423, 9689, 9941, 11213]) ; end: A061652 := proc(n) 2^(A000043(n)-1) ; end: A134710 := proc(n) A061652(n)/2^n ; end: seq(A134710(n), n=1..14) ; # R. J. Mathar, Jan 07 2008 CROSSREFS Cf. A000396, A000668, A019279, A133028. Even superperfect numbers: A061652. Sequence in context: A009595 A018493 A046035 * A009073 A326213 A369699 Adjacent sequences: A134707 A134708 A134709 * A134711 A134712 A134713 KEYWORD nonn AUTHOR Omar E. Pol, Nov 07 2007 EXTENSIONS More terms from R. J. Mathar, Jan 07 2008 STATUS approved

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Last modified July 25 01:41 EDT 2024. Contains 374585 sequences. (Running on oeis4.)