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A160793
Natural numbers and the sum of first n primes interleaved.
4
1, 2, 2, 5, 3, 10, 4, 17, 5, 28, 6, 41, 7, 58, 8, 77, 9, 100, 10, 129, 11, 160, 12, 197, 13, 238, 14, 281, 15, 328, 16, 381, 17, 440, 18, 501, 19, 568, 20, 639, 21, 712, 22, 791, 23, 874, 24, 963, 25, 1060, 26, 1161, 27, 1264, 28, 1371, 29, 1480
OFFSET
1,2
COMMENTS
Also first differences of A160792: length of edges of a square spiral related to prime numbers A000040 whose vertices are the numbers A160792.
A000027 and A007504 interleaved. - Omar E. Pol, Oct 31 2011
LINKS
FORMULA
a(2n-1) = n, a(2n) = A007504(n). - Omar E. Pol, Oct 31 2011
MATHEMATICA
Module[{nn=30, sp}, sp=Accumulate[Prime[Range[nn]]]; Riffle[Range[nn], sp]] (* Harvey P. Dale, May 22 2018 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, May 29 2009
EXTENSIONS
More terms from Sean A. Irvine, Oct 31 2011
New definition from Omar E. Pol, Oct 31 2011
STATUS
approved