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A040040 Average of twin prime pairs (A014574), divided by 2. Or, 2 a(n) +/- 1 are primes. +0
31
2, 3, 6, 9, 15, 21, 30, 36, 51, 54, 69, 75, 90, 96, 99, 114, 120, 135, 141, 156, 174, 210, 216, 231, 261, 285, 300, 309, 321, 330, 405, 411, 414, 429, 441, 510, 516, 525, 531, 546, 576, 615, 639, 645, 651, 660, 714, 726, 741, 744, 804, 810, 834, 849, 861, 894 (list; graph; listen)
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.


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