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A067490
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Powers of 4 with initial digit 1.
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5
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1, 16, 1024, 16384, 1048576, 16777216, 1073741824, 17179869184, 1099511627776, 17592186044416, 1125899906842624, 18014398509481984, 1152921504606846976, 18446744073709551616, 1180591620717411303424, 1208925819614629174706176
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Index to divisibility sequences
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FORMULA
| a(n+1)/a(n) is in {16, 64, 1024}, so 16^n <= a(n+1) < 1024^n. Asymptotically, the exponent should be 100; I can prove that 99^n << a(n) << 101^n. [Charles R Greathouse IV, Jan 19 2012]
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CROSSREFS
| Cf. A067480, A067481, A067482, A067483, A067484, A067485, A067486, A067487, A067488, A067489.
Sequence in context: A070307 A159683 A197104 * A130036 A013735 A180376
Adjacent sequences: A067487 A067488 A067489 * A067491 A067492 A067493
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 09 2002
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