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Revision History for A261142

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A261142

Numbers n such that n, p=prime(n) and q=prime(p) have the same sum of digits.
(history; published version)

#27 by N. J. A. Sloane at Sat Oct 31 14:11:22 EDT 2015

STATUS

editing

approved

#26 by N. J. A. Sloane at Sat Oct 31 14:11:21 EDT 2015

KEYWORD

nonn,changed,base

STATUS

reviewed

editing

#25 by Zak Seidov at Tue Oct 27 18:57:30 EDT 2015

STATUS

proposed

reviewed

#24 by Alois P. Heinz at Tue Oct 27 18:56:13 EDT 2015

STATUS

editing

proposed

#23 by Alois P. Heinz at Tue Oct 27 18:55:53 EDT 2015

DATA

88, 248, 826, 1417, 1571, 1595, 3682, 3928, 4448, 5089, 5137, 6479, 7754, 8038, 8384, 8461, 9257, 9640, 10393, 10825, 10922, 11878, 13294, 14290, 14767, 14941, 15977, 16786, 17684, 17777, 17935, 18437, 18677, 19495, 20497, 20555, 21649, 22487, 23239, 23396

#22 by Alois P. Heinz at Tue Oct 27 18:54:49 EDT 2015

NAME

Numbers n such that n, p=prime(n) and q=prime(p) have the same sum of digits.

EXAMPLE

n=88, p=prime(n)=457 and q=primepprime(p)=3229 have the same sum of digits=16;

STATUS

reviewed

editing

#21 by Zak Seidov at Tue Oct 27 18:17:47 EDT 2015

STATUS

proposed

reviewed

#20 by Zak Seidov at Tue Oct 27 18:17:42 EDT 2015

STATUS

editing

proposed

#19 by Zak Seidov at Thu Oct 22 04:38:53 EDT 2015

NAME

allocated for Zak SeidovNumbers n such that n, p=prime(n) and q=prime(p) have the same sum of digits.

DATA

OFFSET

1,1

COMMENTS

Hence both p and q are Honaker primes (A033548) and both n and p are terms in A033549.

EXAMPLE

n=88, p=prime(n)=457 and q=primep)=3229 have the same sum of digits=16;

n=248, p=prime(n)=1571 and q=prime(p)=13217 have the same sum of digits=14;

n=660349, p=178115131 and q=178115131 have the same sum of digits=28.

CROSSREFS

Cf. A000040, A000720, A007953, A033548, A033549.

KEYWORD

allocated

nonn

AUTHOR

Zak Seidov, Oct 22 2015

STATUS

approved

editing

#18 by Zak Seidov at Thu Oct 22 04:38:53 EDT 2015

NAME

allocated for Zak Seidov

KEYWORD

recycled

allocated