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A279062
Initial terms of the arithmetic progressions in A278735.
3
3, 3, 5, 353, 13297, 1561423, 291461857
OFFSET
1,1
COMMENTS
The first set of 4 prime-indexed primes in arithmetic progression (353, 431, 509, and 587) contains consecutive terms of A142160.
EXAMPLE
a(4) = 353 because 353 = prime(prime(20)), 431 = prime(prime(23)), 509 = prime(prime(25)), 587 = prime(prime(28)), and 431-353 = 509-431 = 587-509 = 78.
The corresponding arithmetic progressions are
3;
3, 5;
5, 11, 17;
353, 431, 509, 587;
13297, 21937, 30577, 39217, 47857;
1561423, 2716423, 3871423, 5026423, 6181423, 7336423;
...
CROSSREFS
Left border of A279021.
Sequence in context: A248592 A132809 A265960 * A367763 A005882 A327824
KEYWORD
nonn,hard,more
AUTHOR
Bobby Jacobs, Dec 05 2016
EXTENSIONS
a(7) from Charles R Greathouse IV, Dec 27 2016
STATUS
approved