A380530 Positions of records in A380528.

1, 4, 10, 42, 366, 3246, 37266, 631266, 11563926, 271591926

Offset

1,2

Comments

Questions: Are all terms squarefree after 4, and do all terms end (in base ten) with digit 6 from the fifth term onward? Is the sequence infinite? Are there any terms with more than four prime factors? See also the conjecture given in A380475, and A380476.

For n = 1..10, A380528(a(n)) = A008578(n). If a(11) exists, it is > 2^30.

Links

Table of n, a(n) for n=1..10.

Index entries for sequences related to primorial base.

Crossrefs

Cf. A008578 (conjectured to give the record values), A380528, A380459, A380468, A380475, A380476.

Sequence in context: A222475 A194993 A280907 * A372648 A332233 A149220

Adjacent sequences: A380526 A380528 A380529 * A380531 A380532 A380533

Keyword

nonn,hard,more,new

Author

Antti Karttunen, Feb 09 2025

Status

approved