A230868 Exponent of leading power of 5 in A230867(n).

1, 2, 4, 9, 15, 165, 317, 488442, 976572, 7629882822, 15258789078

Offset

2,2

Comments

The next term, a(13) = (5^((5^4+5^2+10)/4)+5^((5^2+5)/2)+2*5^2+12)/4 =

53455294201843912922810729343029637576303937602100973959238749843207972\

81974260717340996507118688896298416137695328.

Links

Table of n, a(n) for n=2..12.

Max Alekseyev, Table of expressions for a(n), for n=2..100

Max A. Alekseyev and N. J. A. Sloane, On Kaprekar's Junction Numbers, arXiv:2112.14365, 2021; Journal of Combinatorics and Number Theory, 2022 (to appear).

Example

A230867(5) = 1953134 = 5^9 + 9, so a(5) = 9.

Crossrefs

Cf. A230867.

Sequence in context: A358830 A321410 A218912 * A014290 A337343 A015730

Adjacent sequences: A230865 A230866 A230867 * A230869 A230870 A230871

Keyword

nonn,base,more

Author

N. J. A. Sloane, Nov 05 2013

Extensions

Terms a(9) onward from Max Alekseyev, Nov 05 2013

Status

approved