A147820 Nearest-neighbors of odd primes, divided by 2.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 26, 27, 29, 30, 31, 33, 34, 35, 36, 37, 39, 40, 41, 42, 44, 45, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 63, 64, 65, 66, 68, 69, 70, 74, 75, 76, 78, 79, 81

Offset

1,2

Links

Table of n, a(n) for n=1..61.

Formula

a(n) = A147819(n)/2.

Mathematica

Union[Flatten[{(#-1)/2, (#+1)/2}&/@Prime[Range[2, 40]]]] (* Harvey P. Dale, Oct 19 2011 *)

Crossrefs

Cf. A134926, A134933, A147819.

Sequence in context: A088185 A118844 A247755 * A317469 A194424 A033892

Adjacent sequences: A147817 A147818 A147819 * A147821 A147822 A147823

Keyword

easy,nonn

Author

Omar E. Pol, Nov 14 2008

Status

approved