A108867 - OEIS

A108867

a(1) = 1; a(n) = sum of previous terms a(k) such that a(k) + n is prime.

1, 1, 0, 2, 2, 2, 0, 0, 6, 2, 14, 2, 6, 0, 24, 2, 62, 2, 24, 0, 76, 2, 74, 0, 88, 0, 242, 2, 396, 2, 88, 0, 164, 0, 1018, 2, 532, 0, 1122, 2, 1462, 2, 1638, 0, 1652, 2, 2348, 0, 2808, 0, 3950, 2, 7254, 0, 9560, 0, 5720, 2, 18298, 2, 4292, 0, 22068, 0, 28528, 2, 8194, 0, 76236, 2

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OFFSET

1,4

LINKS

Table of n, a(n) for n=1..70.

EXAMPLE

Among the first 10 terms, a(3)+11, a(4)+11, a(5)+11, a(6)+11, a(7)+11, a(8)+11, a(9)+11 and a(10)+11 are primes. So a(11) = a(3)+a(4)+a(5)+a(6)+a(7)+a(8)+a(9)+a(10) = 14.

PROG

(PARI) {m=70; v=[1]; for(n=2, m, c=0; for(j=1, length(v), if(isprime(v[j]+n), c=c+v[j])); v=concat(v, c)); for(j=1, m, print1(v[j], ", "))}

CROSSREFS

Sequence in context: A329922 A179835 A110857 * A218604 A095767 A241922

Adjacent sequences: A108864 A108865 A108866 * A108868 A108869 A108870

KEYWORD

nonn

AUTHOR

Leroy Quet, Jul 30 2005

EXTENSIONS

More terms and PARI code from Klaus Brockhaus, Aug 04 2005

STATUS

approved