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A230637 Leading power of 4 in A230638. 11
2, 7, 12, 5468, 10924, 5597880, 16777229 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

a(9) = ( 4^5468 + 2*4^12 + 39 ) / 3.

a(10) = 4^5468 + 13.

a(11) = ( 4^10924 + 2*4^5468 + 16407 ) / 3.

a(12) = 4^10924 + 10925

a(13) = ( 4^5597880 + 3*4^10924 + 32793 ) / 3.

a(14) = ( 2*4^5597880 + 32812 ) / 3.

a(15) = ( 4^16777229 + 4^5597880 + 2*4^12 + 16427 ) / 3.

a(16) = ( 2*4^16777229 + 4^13 + 42 ) / 3.

REFERENCES

Max A. Alekseyev, Donovan Johnson and N. J. A. Sloane, On Kaprekar's Junction Numbers, in preparation, 2017.

LINKS

Table of n, a(n) for n=2..8.

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

Index entries for Colombian or self numbers and related sequences

CROSSREFS

Cf. A230638.

Related base-4 sequences:  A053737, A230631, A230632, A010064, A230633, A230634, A230635, A230636, A230637, A230638, A010065 (trajectory of 1)

Sequence in context: A192772 A046243 A230302 * A301852 A103886 A231900

Adjacent sequences:  A230634 A230635 A230636 * A230638 A230639 A230640

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Oct 31 2013

EXTENSIONS

Terms a(8) onward from Max Alekseyev, Oct 31 2013

STATUS

approved

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Last modified October 17 15:01 EDT 2019. Contains 328116 sequences. (Running on oeis4.)