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A057874 Sets of three composites in bidirectional 'sum of prime factors' progression/retrogression. +0
1
95, 119, 143, 174191, 175031, 175871, 298687992, 298688708, 298689424 (list; graph; listen)
OFFSET

0,1

COMMENT

First term of next set > 2000000000.

LINKS

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: A057654 A046005 A045121 this_sequence A112135 A074237 A134217

Adjacent sequences: A057871 A057872 A057873 this_sequence A057875 A057876 A057877

KEYWORD

nonn,hard

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), Sep 15 2000.

EXTENSIONS

This really seems to be three sequences, not one! Should be split. - N. J. A. Sloane (njas(AT)research.att.com).

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.


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