A115900 Numbers k such that k + sigma(k) and k + phi(k) are palindromes.

1, 2, 3, 4, 5, 219, 322, 375, 22248, 32065, 47827, 1406744, 2144055, 2991368, 3626587, 4909369, 172133971, 177457001, 328030055, 3128669654, 8345867631, 19649249526, 45179367929, 47228405729, 48534773039, 49583585599, 2127577449846, 2191781701563, 3972961263797

Offset

1,2

Comments

Intersection of A115895 and A115896.

a(27) > 10^11. 3972961263797 is also a term. - Donovan Johnson, May 31 2013

a(30) > 10^13. - Giovanni Resta, Jun 05 2013

Links

Table of n, a(n) for n=1..29.

Example

4909369 + sigma(4909369) = 9823289 and 4909369 + phi(4909369) = 9814189.

Crossrefs

Cf. A115895, A115896.

Sequence in context: A073787 A274028 A037436 * A349486 A010347 A004878

Adjacent sequences: A115897 A115898 A115899 * A115901 A115902 A115903

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Extensions

a(17)-a(26) from Donovan Johnson, Oct 05 2010

a(27)-a(29) from Giovanni Resta, Jun 05 2013

Status

approved