

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
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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

Harvey P. Dale, Table of n, a(n) for n = 1..1000


FORMULA

a(2n1) = 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

Cf. A000040, A160790, A160791, A160792.
Sequence in context: A163298 A133440 A331520 * A327754 A308096 A006800
Adjacent sequences: A160790 A160791 A160792 * A160794 A160795 A160796


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



