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

Author

Giovanni Resta, Feb 06 2006

Keywords

• nonn
• base

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

Examples

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

Crossrefs

Cf. A115895, A115896.

Extensions

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

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