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A036089
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Centered cube numbers: (n+1)^11+n^11.
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5
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1, 2049, 179195, 4371451, 53022429, 411625181, 2340123799, 10567261335, 39970994201, 131381059609, 385311670611, 1028320041299, 2535168764725, 5841725563701, 12699321029039, 26241941903791, 51864082352049
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Never prime, as a(n) = (2*n+1) * (n^10 +5*n^9 +25*n^8 +70*n^7 +130*n^6 +166*n^5 +148*n^4 +91*n^3 +37*n^2 +9*n +1). Semiprime for n= 1, 2, 23, 69, 89, 95, 230,.. [Jonathan Vos Post, Aug 26 2011]
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REFERENCES
| B. K. Teo and N. J. A. Sloane, Magic numbers in polygonal and polyhedral clusters, Inorgan. Chem. 24 (1985), 4545-4558.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 0..10000
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PROG
| (MAGMA) [(n+1)^11+n^11: n in [0..20]]; // Vincenzo Librandi, Aug 27 2011
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CROSSREFS
| Cf. A008455, A036087, A036088, A100267, A154535, A100266, A152913, A194155, A194185, A194216.
Sequence in context: A060949 A017685 A013959 * A123095 A174752 A045059
Adjacent sequences: A036086 A036087 A036088 * A036090 A036091 A036092
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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