

A073885


a(1)=1, a(n) = smallest positive integer not included earlier such that the nth partial sum is a prime iff n is a prime.


2



1, 2, 4, 3, 7, 5, 9, 8, 6, 10, 12, 11, 19, 13, 14, 16, 17, 15, 21, 20, 18, 22, 24, 23, 25, 26, 27, 28, 33, 29, 31, 30, 32, 34, 35, 36, 43, 37, 38, 40, 39, 41, 49, 42, 45, 44, 67, 46, 47, 48, 50, 51, 54, 53, 52, 56, 57, 55, 63, 58, 60, 59, 61, 64, 62, 65, 69, 68, 66, 70, 72, 71
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


LINKS

Table of n, a(n) for n=1..72.


MATHEMATICA

For[n=1; s={}; sum=0, n<=100, n++, For[v=1, MemberQ[s, v]Xor[PrimeQ[n], PrimeQ[sum+v]], v++, Null]; sum+=v; AppendTo[s, a[n]=v]]; a/@Range[100]


CROSSREFS

Cf. A073886.
Sequence in context: A120619 A346298 A084385 * A256283 A257465 A120234
Adjacent sequences: A073882 A073883 A073884 * A073886 A073887 A073888


KEYWORD

nonn


AUTHOR

Amarnath Murthy, Aug 17 2002


EXTENSIONS

Edited by Dean Hickerson, Oct 22 2002


STATUS

approved



