A102069 - OEIS

A102069

Analogous to the oblong (promic or heteromecic) sequence formed but with reversal digits of factors multiplied.

2, 6, 12, 20, 30, 42, 56, 72, 9, 11, 231, 651, 1271, 2091, 3111, 4331, 5751, 7371, 182, 24, 264, 704, 1344, 2184, 3224, 4464, 5904, 7544, 276, 39, 299, 759, 1419, 2279, 3339, 4599, 6059, 7719, 372, 56, 336, 816, 1496, 2376, 3456, 4736, 6216, 7896, 470, 75, 375

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..51.

FORMULA

a(n) = R(n)*R(n+1), where R(n) is the digital reversal of n.

MATHEMATICA

r[n_]:=FromDigits[Reverse[IntegerDigits[n]]]; Table[r[n]*r[n+1], {n, 51}] (* James C. McMahon, Jan 07 2024 *)

CROSSREFS

Cf. A001129, A002378.

Sequence in context: A298010 A118373 A077252 * A160938 A160926 A077253

Adjacent sequences: A102066 A102067 A102068 * A102070 A102071 A102072

KEYWORD

easy,nonn,base,less

AUTHOR

Michael Joseph Halm, Feb 12 2005

STATUS

approved