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 A117985 Pentagonal numbers with only odd digits. 2
 1, 5, 35, 51, 117, 715, 1335, 1717, 3151, 3577, 5551, 5735, 7315, 7957, 15555, 55777, 71177, 73151, 99717, 135751, 171197, 319935, 331115, 335357, 371757, 377755, 711737, 755795, 935755, 1111551, 1517551, 1553977, 1739355, 1911397, 1993537, 3131315, 3311551 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 MATHEMATICA Select[Table[n*(3*n - 1)/2, {n, 0, 3000}], AllTrue[IntegerDigits[#], OddQ] &] (* Amiram Eldar, Feb 06 2021 *) Select[PolygonalNumber[5, Range[1500]], AllTrue[IntegerDigits[#], OddQ]&] (* Harvey P. Dale, Oct 17 2021 *) CROSSREFS Intersection of A000326 and A014261. Cf. A117990. Sequence in context: A128044 A299529 A014632 * A115707 A117793 A145920 Adjacent sequences:  A117982 A117983 A117984 * A117986 A117987 A117988 KEYWORD base,nonn AUTHOR Luc Stevens (lms022(AT)yahoo.com), May 03 2006 EXTENSIONS Missing terms inserted by Amiram Eldar, Feb 06 2021 STATUS approved

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Last modified November 30 19:02 EST 2021. Contains 349424 sequences. (Running on oeis4.)