A057874 Sets of three composites in bidirectional 'sum of prime factors' progression/retrogression.

95, 119, 143, 174191, 175031, 175871, 298687992, 298688708, 298689424

Offset

0,1

Comments

First term of next set > 2000000000.

Links

Table of n, a(n) for n=0..8.

Index entries for sequences related to primes in arithmetic progressions

Example

First set is (95,119,143) all terms having 'sum of prime factors' = 24. So '95' + (5+19) = '119' + (7+17) = '143' AND '143' - (11+13) = '119' - (7+17) = '95'.

Crossrefs

Cf. A050780, A050781, A050703-A050710.

Sequence in context: A339522 A045121 A207374 * A112135 A369342 A368873

Adjacent sequences: A057871 A057872 A057873 * A057875 A057876 A057877

Keyword

nonn,hard

Author

Patrick De Geest, Sep 15 2000

Extensions

This really seems to be three sequences, not one! Should be split. - N. J. A. Sloane

Status

approved