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A068631 a(1) = 4; a(n) = smallest composite number different from the previous ones such that the sum of all the terms is a composite number. 1
4, 6, 8, 9, 12, 10, 14, 15, 16, 18, 20, 21, 22, 25, 24, 26, 28, 27, 30, 33, 32, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 52, 54, 55, 51, 56, 57, 58, 60, 63, 62, 64, 65, 68, 69, 66, 70, 72, 74, 76, 77, 75, 78, 80, 81, 82, 84, 85, 86, 88, 90, 87, 91, 92, 94, 93, 95 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..69.

EXAMPLE

4+6+8+9 = 27. The next term is 12 instead of 10 as 27 +10 is a prime but 27 +12 = 39 is composite.

CROSSREFS

Sequence in context: A105803 A202268 A084985 * A163520 A273546 A176539

Adjacent sequences:  A068628 A068629 A068630 * A068632 A068633 A068634

KEYWORD

easy,nonn

AUTHOR

Amarnath Murthy, Feb 26 2002

EXTENSIONS

More terms from Larry Reeves (larryr(AT)acm.org), Jun 21 2002

STATUS

approved

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Last modified March 25 10:08 EDT 2019. Contains 321469 sequences. (Running on oeis4.)