A176887 Let A001358(n) = prime(m)*prime(k). Then a(n) = abs(prime(m)*k - prime(k)*m).

0, 1, 0, 1, 1, 1, 2, 1, 0, 1, 7, 3, 1, 3, 8, 5, 0, 13, 8, 14, 9, 9, 9, 19, 13, 9, 15, 16, 15, 28, 10, 29, 17, 17, 21, 38, 24, 25, 19, 0, 25, 43, 44, 20, 29, 49, 31, 1, 37, 31, 38, 35, 58, 29, 37, 0, 67, 41, 68, 51, 8, 47, 77, 49, 46, 58, 49, 7, 82, 51, 59, 47, 51, 83, 11, 53, 66, 92, 10

Offset

1,7

Comments

The sequence is defined by considering first m<=k, adding the difference prime(m)*k-prime(k)*m to the sequence if >=0, then considering for the same semiprime m>=k, and adding the difference also to the sequence if >=0 and if different from the previous swapped case. - R. J. Mathar, May 06 2010

Links

Table of n, a(n) for n=1..79.

Example

a(1)=0 because prime(1)*1-prime(1)*1=2-2=0; a(2)=1 because prime(1)*2-prime(2)*1=4-3=1.

Crossrefs

Cf. A001358.

Sequence in context: A265170 A217653 A331161 * A076422 A295861 A337272

Adjacent sequences: A176884 A176885 A176886 * A176888 A176889 A176890

Keyword

nonn,less

Author

Juri-Stepan Gerasimov, Apr 28 2010

Extensions

a(25), a(43), a(44) and maybe others corrected by R. J. Mathar, May 06 2010

New name from Pontus von Brömssen and Charles R Greathouse IV, Apr 18 2022

Status

approved