A104199 - OEIS

A104199

Lower bound on a straddle prime pair.

3, 5, 7, 7, 7, 11, 13, 13, 13, 17, 19, 19, 19, 23, 23, 23, 23, 23, 29, 31, 31, 31, 31, 31, 37, 37, 37, 41, 43, 43, 43, 47, 47, 47, 47, 47, 53, 53, 53, 53, 53, 59, 61, 61, 61, 61, 61, 67, 67, 67, 71, 73, 73, 73, 73, 73, 79, 79, 79, 83, 83, 83, 83, 83, 89, 89, 89, 89, 89, 89, 89

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OFFSET

4,1

COMMENTS

Straddle primes that occur only once on either side of the composite number are lower and upper twin primes respectively.

LINKS

Table of n, a(n) for n=4..74.

FORMULA

Straddle primes are the nearest primes preceding and following a composite number n.

EXAMPLE

The first straddle prime pair is 3 and 5 which straddle the composite number 4.

PROG