

A105089


Sum of the primes in ordered 3 X 3 prime squares.


0



100, 401, 763, 1163, 1601, 2053, 2501, 3017, 3517, 3997, 4479, 5105, 5571, 6045, 6639, 7217, 7741, 8331, 8927, 9417, 9949, 10613, 11201, 11711, 12467, 13063, 13559, 14159, 14653, 15311, 15937, 16661, 17253, 17959, 18531, 19093, 19813, 20461
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..38.


FORMULA

An ordered 3 X 3 prime square is 9 consecutive primes arranged in a square of the form p(9n8) p(9n7) p(9n6) p(9n5) p(9n4) p(9n3) p(9n2) p(9n1) p(9n) n=1, 2, ...


EXAMPLE

The first 3 X 3 prime square
2 3 5
7 11 13
17 19 23
adds up to 100 the first entry in the table.


PROG

(PARI) sumsq3x3(n) = { local(x, j, s); forstep(x=0, n, 9, s=0; for(j=1, 9, s += prime(x+j); ); print1(s", ") ) }


CROSSREFS

Sequence in context: A250806 A250853 A017270 * A017510 A290654 A017642
Adjacent sequences: A105086 A105087 A105088 * A105090 A105091 A105092


KEYWORD

easy,nonn


AUTHOR

Cino Hilliard, Apr 07 2005


STATUS

approved



