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A056867
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Nilpotent numbers: n such that every group of order n is nilpotent.
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4
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1, 2, 3, 4, 5, 7, 8, 9, 11, 13, 15, 16, 17, 19, 23, 25, 27, 29, 31, 32, 33, 35, 37, 41, 43, 45, 47, 49, 51, 53, 59, 61, 64, 65, 67, 69, 71, 73, 77, 79, 81, 83, 85, 87, 89, 91, 95, 97, 99, 101, 103, 107, 109, 113, 115, 119, 121, 123, 125, 127, 128, 131, 133, 135, 137, 139
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| T. D. Noe, Table of n, a(n) for n=1..1000
J. Pakianathan and K. Shankar, Nilpotent Numbers, Amer. Math. Monthly, 107, August-September 2000, 631-634.
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PROG
| (PARI) is(n)=my(f=factor(n), k=#f[, 1]); for(i=1, k, for(j=1, k, if(i!=j&&f[i, 1]^f[i, 2]%f[j, 1]==1, return(0)))); 1 \\ Charles R Greathouse IV, Nov 26 2011
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CROSSREFS
| Cf. A003277, A051532, A056866. Complement of A056868.
Sequence in context: A174894 A088948 A115405 * A062491 A087092 A046684
Adjacent sequences: A056864 A056865 A056866 * A056868 A056869 A056870
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KEYWORD
| nonn,nice,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Sep 02 2000
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EXTENSIONS
| More terms from Francisco Salinas (franciscodesalinas(AT)hotmail.com), Dec 25 2001
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