A056794 Numbers n such that n*(n-1) is an oblong (promic, A002378) palindrome.

1, 2, 3, 17, 78, 539, 1622, 2458, 5292, 5314, 52009, 142402, 143499, 1610152, 1713544, 4670029, 5218984, 15137567, 15282412, 15814149, 47370059, 50702752, 142594227, 166691109, 1694576062, 2554554553, 25541432473, 47878213559, 77714915543

Offset

1,2

Links

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

Mathematica

Do[c=RealDigits[n*(n-1)][[1]]; If[c=Reverse[c], Print[n]], {n, 1, 10^8}]

Prog

(PARI) is(n)=my(d=digits(n^2-n)); d==Vecrev(d) \\ Charles R Greathouse IV, Mar 16 2022

Crossrefs

Cf. A002378.

Sequence in context: A220703 A342547 A245799 * A135726 A259535 A328340

Adjacent sequences: A056791 A056792 A056793 * A056795 A056796 A056797

Keyword

nonn,base

Author

Robert G. Wilson v, Aug 21 2000

Extensions

More terms from Sean A. Irvine, May 09 2022

Status

approved