A084997 Numbers which can be written as the sum as well as the product of 2 primes, not necessarily the same.

4, 6, 10, 14, 15, 21, 22, 26, 33, 34, 38, 39, 46, 55, 58, 62, 69, 74, 82, 85, 86, 91, 94, 106, 111, 115, 118, 122, 129, 133, 134, 141, 142, 146, 158, 159, 166, 178, 183, 194, 201, 202, 206, 213, 214, 218, 226, 235, 253, 254, 259, 262, 265, 274, 278

Offset

1,1

Comments

Intersection of A014091 and A001358; A100484 is a subsequence.

Links

Table of n, a(n) for n=1..55.

Eric Weisstein's World of Mathematics, Goldbach Conjecture

Index entries for sequences related to Goldbach conjecture

Example

n=14: 11 + 3 = 14 and 2 * 7 = 14, therefore 14 is a term;
n=15: 13 + 2 = 15 and 3 * 5 = 15, therefore 15 is a term.
E.g. 21 = 19 + 2, 19 and 2 are prime and 21 = 7 * 3, 7 and 3 are primes.
Example: 9 = 3*3 and 2+7

Crossrefs

Cf. A014091, A100962.

Sequence in context: A268185 A065073 A359157 * A300912 A175706 A110507

Adjacent sequences: A084994 A084995 A084996 * A084998 A084999 A085000

Keyword

nonn,easy

Author

Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 30 2003

Extensions

Corrected and extended by Michael Lahm (mpl148(AT)psu.edu), Apr 24 2006

More terms from Joseph A. Agnew (jaa249(AT)psu.edu), Apr 30 2006

Status

approved