A211006 Pair (n,p) where n is the sum of adjacent nonprimes and p is the sum of adjacent primes.

1, 5, 4, 5, 6, 7, 27, 11, 12, 13, 45, 17, 18, 19, 63, 23, 130, 29, 30, 31, 170, 37, 117, 41, 42, 43, 135, 47, 250, 53, 280, 59, 60, 61, 320, 67, 207, 71, 72, 73, 380, 79, 243, 83, 430, 89, 651, 97, 297, 101, 102, 103, 315, 107, 108, 109, 333, 113, 1560, 127, 387, 131

Offset: 1

Author

Omar E. Pol, Aug 11 2012

Keywords

• nonn
• tabf

Examples

			-----------------------------------------
.     Array from
n      A000027                      a(n)
-----------------------------------------
1         1;                          1
2         2, 3;                       5
3         4;                          4
4         5;                          5
5         6;                          6
6         7;                          7
7         8, 9, 10;                  27
8        11;                         11
9        12;                         12
10       13;                         13
11       14, 15, 16;                 45
12       17;                         17
13       18;                         18
14       19;                         19
15       20, 21, 22;                 63
16       23;                         23
17       24, 25, 26, 27, 28;        130
		

Crossrefs

Partial sums give A211007.

A variant of A109921.

Cf. A000040, A018252, A054265, A211005.

Formula

a(n) = A109921(n+2), n >= 3.