OFFSET
1,2
COMMENTS
Without the initial term, identical to A024675, cf. formula. Except for the initial terms, also the same as A162800. - M. F. Hasler, Jun 01 2013
LINKS
Paolo Xausa, Table of n, a(n) for n = 1..10000
FORMULA
EXAMPLE
a(1) = 1 = -2+3. a(2) = 4=3-4+5. a(3) = 6 =5-6+7. a(4) = 9 = 7-8+9-10+11.
MATHEMATICA
Join[{1}, Most[#] + Differences[#]/2] & [Prime[Range[2, 100]]] (* Paolo Xausa, Jun 17 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Jul 13 2009
EXTENSIONS
Edited by R. J. Mathar, Sep 23 2009
STATUS
approved