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 A038457 |First digit-last digit| for triangular numbers. 1
 0, 0, 0, 0, 1, 4, 1, 6, 3, 1, 0, 0, 1, 8, 4, 1, 5, 2, 0, 1, 2, 1, 1, 4, 3, 2, 2, 5, 2, 1, 1, 2, 3, 4, 0, 6, 0, 4, 6, 7, 8, 7, 6, 3, 9, 4, 0, 7, 5, 4, 4, 5, 7, 0, 4, 1, 5, 2, 0, 1, 1, 0, 2, 4, 2, 3, 1, 6, 4, 3, 3, 4, 6, 1, 3, 2, 4, 0, 2, 3, 3, 2, 0, 3, 3, 2, 2, 5, 3, 1, 1, 2, 4, 3, 1, 4, 2, 1, 3, 4, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 LINKS FORMULA a(n) = A040163(A000217(n)). - Michel Marcus, Sep 27 2013 CROSSREFS Cf. A000217. Sequence in context: A098987 A174390 A153017 * A141649 A101347 A200344 Adjacent sequences:  A038454 A038455 A038456 * A038458 A038459 A038460 KEYWORD easy,nonn,base AUTHOR STATUS approved

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Last modified September 15 21:06 EDT 2019. Contains 327088 sequences. (Running on oeis4.)