The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A062398

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A062398

Numbers such that the product of the digits and the sum of the digits are squares.
(history; published version)

#16 by Sean A. Irvine at Tue Mar 28 21:13:19 EDT 2023

STATUS

editing

approved

#15 by Sean A. Irvine at Tue Mar 28 21:13:14 EDT 2023

CROSSREFS

Cf. A028839.

STATUS

approved

editing

#14 by Alois P. Heinz at Sat Jun 30 16:21:02 EDT 2018

STATUS

reviewed

approved

#13 by Joerg Arndt at Sat Jun 30 13:20:48 EDT 2018

STATUS

proposed

reviewed

#12 by Joerg Arndt at Sat Jun 30 13:20:44 EDT 2018

STATUS

editing

proposed

#11 by Joerg Arndt at Sat Jun 30 13:20:42 EDT 2018

CROSSREFS

Cf. A062397.

STATUS

proposed

editing

#10 by Jon E. Schoenfield at Fri Jun 29 00:16:07 EDT 2018

STATUS

editing

proposed

Discussion

Fri Jun 29

02:32

Michel Marcus: A062397 ??

#9 by Jon E. Schoenfield at Fri Jun 29 00:16:04 EDT 2018

LINKS

Harry J. Smith, <a href="/A062398/b062398.txt">Table of n, a(n) for n = 1,...,1000</a>

PROG

(PARI) SumD(x)= { s=0; while (x>9, s+=x-10*(x\10); x\=10); return(s + x) } ProdD(x)= { p=1; while (x>9, p*=(x-10*(x\10)); x\=10); return(p*x) } { n=0; for (m=1, 10^9, if (issquare(ProdD(m)) && issquare(SumD(m)), write("b062398.txt", n++, " ", m); if (n==1000, break)) ) } [From _\\ _Harry J. Smith_, Aug 07 2009]

STATUS

approved

editing

#8 by N. J. A. Sloane at Thu Dec 05 19:55:03 EST 2013

AUTHOR

_Amarnath Murthy (amarnath_murthy(AT)yahoo.com), _, Jun 28 2001

Discussion

Thu Dec 05

19:55

OEIS Server: https://oeis.org/edit/global/2075

#7 by Harvey P. Dale at Mon Aug 20 18:45:19 EDT 2012

STATUS

editing

approved