A078916 a(n) = prime(n) + 2*n.
4, 7, 11, 15, 21, 25, 31, 35, 41, 49, 53, 61, 67, 71, 77, 85, 93, 97, 105, 111, 115, 123, 129, 137, 147, 153, 157, 163, 167, 173, 189, 195, 203, 207, 219, 223, 231, 239, 245, 253, 261, 265, 277, 281, 287, 291, 305, 319, 325, 329, 335, 343, 347, 359, 367, 375
Offset: 1
Keywords
Programs
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Magma
[ &+[(2*n+NthPrime(n))]: n in [1..1000] ]; // Vincenzo Librandi, Aug 01 2010
Formula
a(n) = A014688(n) + n. - Zak Seidov, Nov 10 2013