

A124141


Numbers k such that there is a number m < k satisfying A000203(k) = A000203(m) = m + k  gcd(m,k).


1



38, 92, 153, 284, 332, 459, 494, 885, 956, 1035, 1358, 1784, 2295, 2528, 2678, 5434, 5607, 6027, 6255, 7564, 7928, 8235, 8648, 9729, 10325, 10413, 12008, 14104, 15813, 16198
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..30.


EXAMPLE

38 is in the sequence because A000203(24) = A000203(38) = 60 = 24 + 38  gcd(24,38).


PROG

(PARI) isok(k) = {my(sk = sigma(k)); for (m=1, k, if ((sk == sigma(m)) && (sk == m + k  gcd(m, k)), return (1)); ); return (0); } \\ Michel Marcus, Oct 27 2019


CROSSREFS

Cf. A124140.
Subsequence of A069822.
Sequence in context: A235087 A235080 A218331 * A093649 A020167 A186439
Adjacent sequences: A124138 A124139 A124140 * A124142 A124143 A124144


KEYWORD

nonn,more


AUTHOR

Yasutoshi Kohmoto, Dec 01 2006


EXTENSIONS

Edited by Stefan Steinerberger, Aug 14 2007


STATUS

approved



