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A331524 a(n) is the least positive k such that A006686(n) - k^8 is an eighth power. 2
1, 1, 1, 5, 3, 7, 2, 8, 3, 8, 9, 13, 4, 4, 17, 7, 17, 2, 8, 3, 5, 20, 7, 11, 17, 8, 23, 19, 10, 20, 3, 11, 17, 10, 22, 19, 14, 22, 17, 21, 25, 11, 13, 23, 27, 8, 32, 25, 33, 6, 25, 35, 7, 23, 31, 10, 37, 16, 18, 39, 5, 7, 42, 41, 30, 36, 5, 11, 8, 18, 30, 36 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program for A331524

EXAMPLE

The first terms, alongside A006686(n), are:

  n   a(n)  A006686(n)

  --  ----  -----------------------

   1     1           2 = 1^8 +  1^8

   2     1         257 = 1^8 +  2^8

   3     1       65537 = 1^8 +  4^8

   4     5     2070241 = 5^8 +  6^8

   5     3   100006561 = 3^8 + 10^8

   6     7   435746497 = 7^8 + 12^8

   7     2   815730977 = 2^8 + 13^8

   8     8   832507937 = 8^8 + 13^8

   9     3  1475795617 = 3^8 + 14^8

  10     8  2579667841 = 8^8 + 15^8

PROG

(PARI) See Links section.

CROSSREFS

See A331435 for similar sequences.

Cf. A001016, A006686.

Sequence in context: A201752 A117126 A048997 * A096635 A021953 A171530

Adjacent sequences:  A331521 A331522 A331523 * A331525 A331526 A331527

KEYWORD

nonn

AUTHOR

Rémy Sigrist, Jan 19 2020

STATUS

approved

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Last modified February 17 12:32 EST 2020. Contains 331996 sequences. (Running on oeis4.)