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A372078
Primes p that are introduced in A373390 by 3*p.
13
5, 13, 17, 29, 41, 43, 47, 59, 67, 97, 157
OFFSET
1,1
COMMENTS
Conjecture: there are no other terms. (See the comments and conjectures in A373790.)
These are primes numbered 3, 6, 7, 10, 13, 14, 15, 17, 19, 25, 37.
They appear in A373390 at indices 9, 25, 35, 61, 85, 91, 99, 126, 139, 204, 335.
157 is the 37th prime. The conjecture is that for the 38th and all later primes p, in A373390 there are three successive terms 2*p, x, p. The values of x are given in A373790.
EXAMPLE
The first (and only) multiple of 13 in A373390 that precedes A373390(25) = 13 is A373390(23) = 39 = 3*13, so 13 is a term.
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 18 2024
STATUS
approved