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A237522 Numbers n such that phi(n) + sigma(n) = reversal(n) - 1. 4
25, 165261124, 1698757933 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(4), if it exists, is larger than 10^13.

LINKS

Table of n, a(n) for n=1..3.

EXAMPLE

n = 165261124 is a term, because phi(n) = 67233600, sigma(n) = 353928960 and 67233600 + 353928960 = 421162561 - 1, where 421162561 is the reversal of 165261124.

CROSSREFS

Cf. A070272, A230004, A230005, A230006, A230019, A136544, A237521.

Sequence in context: A228536 A191559 A279039 * A116197 A023924 A022066

Adjacent sequences:  A237519 A237520 A237521 * A237523 A237524 A237525

KEYWORD

base,nonn,bref,more

AUTHOR

Giovanni Resta, Feb 08 2014

STATUS

approved

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Last modified September 17 06:00 EDT 2019. Contains 327119 sequences. (Running on oeis4.)