A065524 The (5^n)-th composite number.

4, 10, 38, 164, 760, 3634, 17653, 86542, 426510, 2109602, 10458654, 51938515, 258246036, 1285227649, 6400837884, 31896080698, 159013169263, 793026358830, 3956152086139, 19740921224246, 98526658283206, 491833651069513, 2455555405866035, 12261373736046802

Offset

0,1

Links

Table of n, a(n) for n=0..23.

Mathematica

Composite[n_Integer] := Block[ {k = n + PrimePi[n] + 1 }, While[ k != n + PrimePi[k] + 1, k = n + PrimePi[k] + 1]; Return[ k ]]; Table[ Composite[5^n], {n, 0, 18} ]

Crossrefs

Sequence in context: A149199 A149200 A149201 * A024689 A320806 A149202

Adjacent sequences: A065521 A065522 A065523 * A065525 A065526 A065527

Keyword

nonn

Author

Robert G. Wilson v, Nov 27 2001

Extensions

a(19)-a(23) from Chai Wah Wu, Apr 21 2018

Status

approved