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).

21, 34, 192, 310, 373, 536, 12000

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