

A136022


First differences of A136021.


1



19, 1028, 63326, 4417267, 336418691, 27095099730, 2264740360646, 194526458511192, 17050085068702458, 1517704371492095702, 136758640772944755122, 12445444666179480674989, 1141852084948606732236114, 105483948921834512942168239
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..14.


FORMULA

a(n) = A136021(n)A136021(n1).


EXAMPLE

a(1)=19 because at 10^0 the prime divisor sum in A136021 is zero, so 190=19. From the second sum in A136021, 1047, subtract 19, so that a(2) = 1028.


CROSSREFS

Cf. A136021.
Sequence in context: A192569 A238740 A285862 * A203582 A136021 A195214
Adjacent sequences: A136019 A136020 A136021 * A136023 A136024 A136025


KEYWORD

more,nonn


AUTHOR

Enoch Haga, Dec 10 2007, Dec 12 2007


EXTENSIONS

a(6) from R. J. Mathar, Dec 12 2007
Edited by R. J. Mathar, Apr 17 2009
a(7)a(11) from Max Alekseyev, Jan 30 2012
a(12)a(14) from Hiroaki Yamanouchi, Jun 29 2014


STATUS

approved



