A154371 Duplicate of A119613.

10, 14, 15, 20, 26, 28, 30, 35, 38, 40, 42, 45, 50, 52, 56, 60, 62, 70, 75, 76, 78, 80, 84, 86, 90, 98, 100, 104, 112, 114, 120, 122, 124, 126, 130, 135, 140, 143, 146, 150, 152, 156, 160, 168, 172, 175, 180, 182, 186, 190, 196, 200, 206, 208, 210, 218, 224, 225

Offset

1,1

Comments

Duplicate of A119613 - Georg Fischer, Oct 01 2018

Links

Table of n, a(n) for n=1..58.

Formula

a(n) = A002808(A154370(n)). [From R. J. Mathar, May 05 2010]

Example

If 10(composite)=5*2 and 5-2=3(prime), then 10=a(1). If 14(composite)=7*2 and 7-2=5(prime), then 14=a(2). If 15(composite)=5*3 and 5-3=2(prime), then 15=a(3). If 20(composite)=5*2*2 and 5-2=3(prime), 20=a(4), etc.

Crossrefs

Cf. A000040, A002808.

Sequence in context: A307589 A209800 A119613 * A172509 A036338 A108793

Adjacent sequences: A154368 A154369 A154370 * A154372 A154373 A154374

Keyword

dead

Author

Juri-Stepan Gerasimov, Jan 08 2009

Extensions

Corrected (62 inserted, 133 removed....) by R. J. Mathar, May 05 2010

Status

approved