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

Offset: 1

Author

Michael Joseph Halm, Feb 12 2005

Keywords

• easy
• nonn
• base
• less

Crossrefs

Cf. A001129, A002378.

Programs

Mathematica

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

Formula

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