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A092960
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Least square of the form 'sum of n successive terms of a geometric progression + 1', or 0 if no such square exists.
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0
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1, 4, 36, 16, 900, 64, 15876, 256, 47524, 1024, 386884, 4096, 67076100, 16384, 21921124, 65536, 17179344900, 262144, 274875809796, 1048576, 148371336100, 4194304, 9206236135684, 16777216, 1167694198801, 67108864, 367640742081600
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Conjecture: No term is zero.
If n is even, a(n) = 2^n. - Ray G. Opao (1260(AT)email.com), Feb 25 2005
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EXAMPLE
| a(3) = 64 = (3 + 12 + 48) + 1, a(4) = 16 = (1 + 2 + 4 + 8) + 1.
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CROSSREFS
| Cf. A092959.
Sequence in context: A110219 A174413 A162990 * A144153 A027644 A174426
Adjacent sequences: A092957 A092958 A092959 * A092961 A092962 A092963
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2004
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EXTENSIONS
| Corrected and extended by Ray G. Opao (1260(AT)email.com), Feb 25 2005
a(11)-a(27) from Donovan Johnson (donovan.johnson(AT)yahoo.com), May 20 2010
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