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A187399 A puzzle called "The hidden prime". 0
12429793, 124097, 14239807, 135697, 7561, 15209167, 702991 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The first six terms are all emirps. - Arkadiusz Wesolowski, Mar 09 2011

Carlos Rivera asks for a 6-digit number (prime?) that follows from the first six numbers. No solution has been posted after several years. - T. D. Noe, Mar 09 2011

The sequence is a cycle of emirps with the middle two digits of each term the same as the second and next-to-last digits of the subsequent term. The first six terms are as given, the seventh term is the unique six-digit extension. - J. D. Lavelle, Jul 01 2018

LINKS

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

Carlos Rivera, Puzzle 238

CROSSREFS

Cf. A006567.

Sequence in context: A070189 A178069 A167233 * A102335 A083405 A147749

Adjacent sequences:  A187396 A187397 A187398 * A187400 A187401 A187402

KEYWORD

nonn,fini,full

AUTHOR

Arkadiusz Wesolowski, Mar 09 2011

EXTENSIONS

Puzzle solved and a(7) added by J. D. Lavelle, Jul 01 2018

STATUS

approved

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Last modified September 24 22:27 EDT 2018. Contains 315360 sequences. (Running on oeis4.)