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A231623 Smallest starting deficient number for n consecutive deficient numbers in arithmetic progression. 6
1, 1, 1, 2987, 801339, 221355125, 221355125 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,4

COMMENTS

The next term is a(10) > 10^9. The common difference for first 3 terms is 1 and for next 4 terms is 2.

LINKS

Table of n, a(n) for n=3..9.

EXAMPLE

First and smallest occurrence of n, n >= 3, consecutive deficient numbers in arithmetic progression:

a(3) = 1: (1, 2, 3);

a(4) = 1: (1, 2, 3, 4);

a(5) = 1: (1, 2, 3, 4, 5);

a(6) = 2987: (2987, 2989, 2991, 2993, 2995, 2997);

a(7) = 801339: (801339, 801341, 801343, 801345, 801347, 801349, 801351);

a(8) = 221355125: (221355125, 221355127, 221355129, 221355131, 221355133, 221355135, 221355137, 221355139);

a(9) = 221355125: (221355125, 221355127, 221355129, 221355131, 221355133, 221355135, 221355137, 221355139, 221355141);

CROSSREFS

Cf. A005100, A228433.

Sequence in context: A186866 A252571 A231628 * A108926 A159731 A221725

Adjacent sequences:  A231620 A231621 A231622 * A231624 A231625 A231626

KEYWORD

nonn,hard,more

AUTHOR

Shyam Sunder Gupta, Nov 11 2013

STATUS

approved

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Last modified January 18 21:06 EST 2021. Contains 340262 sequences. (Running on oeis4.)