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

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

Offset: 2

Author

N. J. A. Sloane, Nov 05 2013

Keywords

• nonn
• base

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.

Examples

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

Links

• Pontus von Brömssen, Table of n, a(n) for n = 2..16 (based on Alekseyev's Table of expressions for a(n))
• 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 12:3 (2022), 115-155.

Crossrefs

Cf. A230867.

Extensions

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