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A261408 Numbers k such that A260864(k) is a prime or probable prime, where A260864(k) is the number whose base-14 representation is the concatenation of the base-14 representations of (1, ..., k, k-1, ..., 1). 2
21, 34, 192, 310, 373, 536, 12000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The subsequence of those A261171(n) for which A261172(n) = 14. - M. F. Hasler, Aug 23 2015

REFERENCES

David Broadhurst, email to N. J. A. Sloane, Aug 23 2015

LINKS

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

CROSSREFS

Cf. A260343, A260864.

See also A260871 which lists all primes of the form A[b](k), and A261171 and A261172 which list the k and b values of these primes. - M. F. Hasler, Aug 23 2015

Sequence in context: A053409 A253910 A144205 * A008946 A095738 A216467

Adjacent sequences: A261405 A261406 A261407 * A261409 A261410 A261411

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Aug 22 2015

EXTENSIONS

More explicit title from M. F. Hasler, Aug 23 2015

STATUS

approved

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Last modified March 31 02:49 EDT 2023. Contains 361623 sequences. (Running on oeis4.)