A075131 Picture-perfect numbers of form 57*p for p in A075130. The decimal reversal is equal to the sum of the reversed proper divisors.

7980062073, 79862699373, 798006269373, 7986207926373, 79862079269373, 798062073062073, 798620736269373, 7980000620792073, 7980006269999373, 7980620730626373, 7980626373062073, 7980626379269373, 7986207306269373

Offset: 1

Author

Jens Kruse Andersen, Sep 04 2002

Keywords

• base
• nonn

Comments

All known picture-perfect numbers are of this form, except the first 4 in A069942. - Jens Kruse Andersen, May 06 2008

Examples

			a(4)=57*140108910989=7986207926373.
		

Links

• Discussion forum, Systematic Undertaking to Find Picture-Perfect Numbers
• Joseph Pe, Picture-Perfect Numbers and Other Digit-Reversal Diversions

Crossrefs

a(n) = 57*A075130(n)

Cf. A075130, A069942.

Extensions

Edited by Jens Kruse Andersen, May 06 2008