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A193888 Prime numbers p for which p1=base(p,9), p2=base(p1,8), p3=base(p2,7) and p4=base(p3,6) are prime, where base(N,b) means N written in base b and read in base 10. 2
2, 3, 5, 136447, 1555117, 2520943, 3085063, 4517173, 4755061, 5761801, 7991773, 8997883, 9057493, 9193543, 9672373, 10964449 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Sequence suggested by a question posed in the "primenumbers" group, cf. Link.
LINKS
J. Brennen, in reply to J. Merickel, Problem that should be solvable requiring scientific approach on yahoo group "primenumbers", Aug 07 2011
James Merickel, Jack Brennen and others, Problem that should be solvable requiring scientific approach, digest of 11 messages in primenumbers Yahoo group, Aug 6 - Aug 7, 2011.
FORMULA
A193888 = { prime(n) | A193889(n) < 6 }.
CROSSREFS
Sequence in context: A175309 A357323 A335304 * A361312 A305192 A141186
KEYWORD
nonn
AUTHOR
M. F. Hasler, Aug 07 2011
STATUS
approved

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Last modified March 19 04:26 EDT 2024. Contains 370952 sequences. (Running on oeis4.)