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 A115170 Non-cubefree numbers n such that 2n+1 is also non-cubefree (A046099). 2
 40, 256, 312, 472, 688, 904, 1120, 1200, 1312, 1336, 1552, 1768, 1984, 2187, 2200, 2312, 2416, 2456, 2632, 2848, 2875, 3064, 3280, 3312, 3429, 3496, 3712, 3928, 3944, 4144, 4312, 4360, 4576, 4792, 5008, 5224, 5312, 5440, 5562, 5656, 5872, 6088, 6250, 6304, 6312, 6345, 6520, 6655, 6688, 6736, 6952 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The probability that a random integer is cubefree is 1/zeta(3) (see A088453). LINKS R. J. Mathar, Table of n, a(n) for n = 1..700 EXAMPLE 312 is there because 2^3 divides 312 and 5^3 divides 312*2+1. CROSSREFS Cf. A005384 (n and 2n+1 prime), A046099, A088453, A111153 (n and 2n+1 semiprime), A117204 (n and 2n+1 squarefree), A115228. Sequence in context: A229632 A223426 A290127 * A247406 A229588 A334121 Adjacent sequences: A115167 A115168 A115169 * A115171 A115172 A115173 KEYWORD easy,nonn AUTHOR Jonathan Vos Post, Mar 03 2006 EXTENSIONS Edited by Don Reble, Mar 05 2006 2875 inserted by R. J. Mathar, Dec 08 2015 STATUS approved

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Last modified March 31 11:51 EDT 2023. Contains 361648 sequences. (Running on oeis4.)