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Search: id:A071117
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| A071117 |
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Sum of first n digits of decimal expansion of e is prime. |
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+0
2
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| 1, 7, 8, 10, 18, 24, 38, 42, 52, 54, 64, 100, 107, 112, 113, 114, 135, 144, 145, 150, 151, 159, 162, 172, 177, 184, 189, 196, 197, 202, 213, 214, 223, 228, 230, 232, 238, 239, 240, 252, 255, 264, 267, 272, 278, 283, 302, 314, 315, 316, 332, 338, 366, 367, 374
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(2)=7 because 2+7+1+8+2+8+1 = 29.
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MATHEMATICA
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a = First[ RealDigits[ N[ E, 400]]]; Do[ If[ PrimeQ[Plus @@ Take[a, n]], Print[n]], {n, 1, 375}]
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CROSSREFS
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Cf. A001113.
Cf. A001113, A058938.
Sequence in context: A127164 A153972 A111064 this_sequence A054221 A090385 A145826
Adjacent sequences: A071114 A071115 A071116 this_sequence A071118 A071119 A071120
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KEYWORD
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base,easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), May 27 2002
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