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A133762 Odd composite numbers such that the sum of any two terms, plus 1, is a prime. 0
9, 21, 49, 51, 57, 141, 1011, 2661, 21471, 64869, 357561, 1750989, 5409570201, 107563623099, 657637783581 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

49 is a term in the sequence because 49 is an odd composite, 49+9+1=59 and 49+21+1=71, are both primes.

CROSSREFS

Sequence in context: A173391 A259243 A241747 * A160414 A256530 A118130

Adjacent sequences:  A133759 A133760 A133761 * A133763 A133764 A133765

KEYWORD

more,nonn

AUTHOR

Randy L. Ekl, Jan 01 2008

EXTENSIONS

3 more terms from Donovan Johnson, Mar 06 2008

STATUS

approved

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Last modified August 3 07:47 EDT 2021. Contains 346435 sequences. (Running on oeis4.)