A261170 - OEIS

A261170

Number of decimal digits of A260871(n), where A260871 lists primes whose base-b representation is the concatenation of the base-b representations of (1, 2, ..., k, k-1, ..., 1).

2, 3, 4, 5, 7, 9, 17, 20, 31, 38, 43, 64, 64, 70, 91, 93, 102, 117, 120, 123, 127, 127, 127, 136, 160, 166, 176, 235, 321, 351, 353, 389, 403, 418, 418, 421, 422, 466, 542, 578, 579, 703, 706, 725, 731, 765, 780, 792, 795, 799, 803, 839, 840, 848, 849, 863

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OFFSET

1,1

COMMENTS

Larger values based on computations by D. Broadhurst, cf. data file in A260871.

See A261171 and A261172 for the k- and b-values such that A260871(n) = A[b](k), where the sequences A[b] of numbers whose base-b representation is the concatenation of the base-b representations of (1, 2, ..., k, k-1, ..., 1) are listed in A173427, A260853 - A260859, A173426, A260861 - A260866 and A260860 for bases b=2, ..., b=16 and b=60.

LINKS

M. F. Hasler, Table of n, a(n) for n = 1..434

CROSSREFS

Sequence in context: A252023 A282895 A293535 * A051453 A357166 A302940

Adjacent sequences: A261167 A261168 A261169 * A261171 A261172 A261173

KEYWORD

nonn,base,hard

AUTHOR

M. F. Hasler, Sep 15 2015

STATUS

approved