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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

Table of n, a(n) for n=0..100.

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

Felice Russo

STATUS

approved

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Last modified March 23 01:23 EDT 2017. Contains 283901 sequences.