A274825 Gaps associated with the arithmetic progressions in A278735.

0, 2, 6, 78, 8640, 1155000, 82419540

Offset

1,2

Comments

The first set of 4 prime-indexed primes in arithmetic progression (353, 431, 509, and 587) contains consecutive terms of A142160.

Links

Table of n, a(n) for n=1..7.

Example

a(4) = 78 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.
For the corresponding arithmetic progressions, see Charles R Greathouse IV's example in A278735. - Bobby Jacobs, Jan 02 2017

Crossrefs

Cf. A006450, A093364, A142160, A278735, A279021, A279062.

Sequence in context: A327052 A231508 A136306 * A376059 A376061 A076146

Adjacent sequences: A274822 A274823 A274824 * A274826 A274827 A274828

Keyword

nonn,hard,more

Author

Bobby Jacobs, Dec 08 2016

Extensions

a(7) from Bobby Jacobs, Jan 02 2017

Status

approved