

A097464


5infinitary perfect numbers: n such that 5infinitarysigma(n)=2*n.


3




OFFSET

1,1


COMMENTS

Here 5infinitarysigma(a) means sum of 5infinitarydivisor of a. If n=Product p_i^r_i and d=Product p_i^s_i, each s_i has a digit a<=b in its 5ary expansion everywhere that the corresponding r_i has a digit b, then d is a 5infinitarydivisor of n.
Is it certain that 308474880 is the 6th term? M. F. Hasler, Nov 20 2010


LINKS

Table of n, a(n) for n=1..6.


FORMULA

{n: A097863(n) = 2*n}.


EXAMPLE

Factorizations: 2*3, 2^2*7, 2^4*31, 2^5*3^3*5*11, 2^5*3^2*7*11*13, 2^10*3*5*7*19*151


CROSSREFS

Cf. A074849.
Sequence in context: A000396 A152953 A066239 * A166998 A038182 A095723
Adjacent sequences: A097461 A097462 A097463 * A097465 A097466 A097467


KEYWORD

nonn


AUTHOR

Yasutoshi Kohmoto


EXTENSIONS

Missing a(4) inserted by R. J. Mathar, Nov 20 2010


STATUS

approved



