A115891 Numbers k such that k times phi(k) is a palindrome.

1, 2, 3, 4, 17, 21, 206, 296, 309, 314, 392, 412, 444, 3016, 3074, 3182, 3552, 3632, 4944, 12998, 52009, 296448, 2306507, 2343809, 2958948, 3842106, 4419666, 14697047, 15137567, 21150749, 25829523, 29916818, 41798278, 157946358, 215882549, 318635303, 442991424

Offset

1,2

Links

Table of n, a(n) for n=1..37.

Example

25829523 * phi(25829523) = 25829523 * 17219628 = 444774777477444.

Crossrefs

Cf. A084122, A115890, A115892.

Sequence in context: A178683 A111191 A333825 * A378417 A359230 A293035

Adjacent sequences: A115888 A115889 A115890 * A115892 A115893 A115894

Keyword

nonn,base

Author

Giovanni Resta, Feb 06 2006

Extensions

a(34)-a(37) from Donovan Johnson, Feb 17 2013

Status

approved