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A132430
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Indices of primes in A075059. Numbers n such that 1+LCM{1, 2, ..., n} is prime.
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0
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0, 1, 2, 3, 4, 5, 6, 7, 9, 10, 19, 20, 21, 22, 25, 26, 31, 47, 48, 89, 90, 91, 92, 93, 94, 95, 96, 127, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 1369, 1370, 1371, 1372, 2251, 2252, 2253, 2254, 2255, 2256, 2257, 2258, 2259, 2260, 2261, 2262, 2263, 2264, 2265, 2266, 3271, 3272, 3273, 3274, 3275, 3276, 3277, 3278, 3279, 3280, 3281, 3282, 3283, 3284, 3285, 3286, 3287, 3288, 3289, 3290, 3291, 3292, 3293, 3294, 3295, 3296, 3297, 3298
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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EXAMPLE
| 8 is not in the sequence because A075059(8) = 1 + A003418(8) = 1 + LCM{1, 2, ..., 8} = 841 = 29^2 is not prime.
127 is in the sequence because A075059(127) = 1 + A003418(127) = 1 + LCM{1, 2, ..., 127} = 6676878045498705789701874602220118271269436344024536001 is prime.
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MATHEMATICA
| Join[{0}, Select[Range[250], PrimeQ[LCM@@Range[#]+1]&]] (* From Harvey P. Dale, Nov 15 2011 *)
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CROSSREFS
| Cf. A000040, A003418, A075059.
Sequence in context: A119984 A059879 A049537 * A039171 A039270 A039208
Adjacent sequences: A132427 A132428 A132429 * A132431 A132432 A132433
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KEYWORD
| nonn
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Nov 13 2007
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EXTENSIONS
| Corrected by Harvey P. Dale, Nov 15 2011
Terms a(39) onward from Max Alekseyev (maxale(AT)gmail.com), Jan 28 2012
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