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 A096787 Primes of form 4n+3 which are the sum of two consecutive composite numbers. 12
 19, 31, 43, 67, 71, 79, 103, 127, 131, 139, 151, 163, 191, 199, 211, 223, 239, 251, 271, 283, 307, 311, 331, 367, 379, 419, 431, 439, 443, 463, 487, 491, 499, 523, 547, 571, 599, 607, 619, 631, 643, 647, 659, 683, 691, 727, 739, 743, 751, 787, 811, 823, 827 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA Equals 1+2*A096788. MATHEMATICA 2Select[ Range[ 450], PrimeQ[ # ] == PrimeQ[ # + 1] == False && PrimeQ[2# + 1, GaussianIntegers -> True] == True &] + 1 (from Robert G. Wilson v Jul 11 2004) PROG (PARI) nextcomposite(k)=if(k<3, 4, if(isprime(k), k+1, k)); {m=440; n=4; while(n

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Last modified June 18 16:55 EDT 2013. Contains 226355 sequences.