A092929 n-th partial arithmetic mean is equal to the n-th noncomposite number or to prime(n-1) for n>1.

1, 3, 5, 11, 15, 31, 25, 45, 35, 59, 89, 53, 109, 93, 71, 107, 149, 161, 97, 181, 151, 115, 211, 175, 233, 297, 205, 157, 219, 167, 233, 561, 259, 335, 207, 499, 223, 379, 391, 323, 413, 425, 265, 621, 281, 377, 291, 775, 799, 423, 329, 437, 551, 347, 791, 587

Offset: 1

Author

Amarnath Murthy, Mar 19 2004

Keywords

• easy
• nonn

Crossrefs

Cf. A092930, A000040 (prime numbers).

Formula

For n>=3: a(n) = n*A000040(n-1) - (n-1)*A000040(n-2). - Bob Selcoe, Nov 26 2015

Extensions

More terms from Ray Chandler, Mar 23 2004