A199595 - OEIS

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A199595

Numbers n such that 3n+6, 3n+7 and 3n+8 are all composite.

1, 4, 9, 11, 14, 18, 21, 23, 24, 31, 32, 33, 34, 37, 40, 41, 44, 46, 49, 51, 54, 55, 60, 61, 62, 64, 65, 66, 71, 74, 75, 77, 79, 81, 84, 88, 89, 91, 92, 93, 94, 99, 100, 101, 102, 104, 106, 107, 111, 113, 114, 116, 118, 121, 123, 124, 127, 128, 130, 131, 134, 135, 138, 141, 143, 144, 149, 150, 151, 153, 154, 157, 158, 161, 163, 164, 165, 168, 169, 170

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

REFERENCES

Ernest V. Miliauskas, letter to N. J. A. Sloane, Dec 21 1985.

LINKS

Table of n, a(n) for n=1..80.

FORMULA

a(n) = A199593(n)-8.

PROG

(PARI) is(n)=!isprime(bitor(3*n+7, 1)) \\ Charles R Greathouse IV, Jul 03 2013

CROSSREFS